Italy recognized the independence of the mountainous republic of San Marino through several treaties beginning in 1862. But a year before that, President Abraham Lincoln wrote a letter accepting an offer of honorary citizenship extended by San Marino at the start of the U.S. Civil War — the first time that the U.S. recognized San Marino's independence.

In 1878, Paraguay was in the midst of a bloody conflict with both Brazil and Argentina — called the Triple Alliance War — and the three countries called on President Hayes to broker a truce. Hayes granted the Gran Chaco lowlands to Paraguay — a piece of land that accounts for about 60% of Paraguay’s current size. Today you’ll find a Paraguayan city named Villa Hayes in his honor, and even a football team is named Club Presidente Hayes.

You’ve heard of Mount Rushmore in South Dakota, but what about Presidents Park in Williamsburg, Virginia? The park once contained 43 giant busts of almost every U.S. president since George Washington. The park closed after financial troubles in 2010, but local farmer Howard Hankins transported the heads back to his family farm in nearby Croake and hopes to rebuild the museum soon.

Thomas Jefferson was also a self-taught architect, among many other interests. The former governor of Virginia sought to reestablish America’s newfound independence when the state was looking to design its new capitol building. Instead of the popular Georgian style of the time (that bore King George of England’s name), Jefferson modeled it after a Roman temple in Nîmes, France, called the Maison Carée (meaning “Square House”).

Some states still have holidays recognizing individual presidents, and Missouri recognizes President Harry Truman’s May 8 birthday as an official state holiday. Why Truman? He is the only Missourian to ever be elected president. Born in 1884, Truman was raised in Independence and later lived in Kansas City before he assumed office in 1945. The Truman Presidential Library and Museum is in Independence, where President Truman is buried alongside his wife Bess.

When Joe Biden was first elected to the Senate to serve Delaware in 1972, at the age of 29, he was the sixth-youngest senator ever elected to office. Biden has long been affiliated with the small mid-Atlantic state, but he was actually born in Scranton, Pennsylvania. Biden isn't the first President to hail from Pennsylvania — James Buchanan was also born in the Keystone State.

In 1880, James Garfield helped popularize the idea of the “front porch campaign,” in which candidates make speeches to supporters who visit them at or close to their homes. Garfield delivered his campaign speeches to thousands from the front porch of his home in Mentor, Ohio, which is now a National Historic Site.

America’s first President accomplished quite a lot during his lifetime, but he wasn’t much of a world traveler. In 1751, his half-brother Lawrence Washington came down with tuberculosis, and George Washington (then 19 years old) accompanied him to spend a winter in sunny Barbados in hopes of recovering. This was the farthest Washington would travel from his Virginia home and the only time he left mainland North America during his life.

Located on the shores of Lake Geneva near the United Nations Office at Geneva, the 5-star Hotel President Wilson is named after the 28th President. After the end of World War I, Wilson founded and championed the League of Nations, an international diplomatic group that was the precursor to the United Nations. So, it makes sense that the hotel was named after the trailblazing world leader.

Many U.S. airports are named after Presidents — from major airports like New York City’s JFK and D.C.’s Ronald Reagan Washington National Airport to smaller ones like Theodore Roosevelt Regional Airport in Dickinson, North Dakota. The only President in this grouping without the honor of having an airport named after him is surprisingly the nation’s first President, George Washington.

Congress passed the Presidential Libraries Act in 1955 to make sure that presidential papers were systematically preserved and accessible to the public. There are now 14 Presidential Libraries, with three in Texas. The Johnson Library is located in Austin, while the Bush Library is in College Station and the George W. Bush Library is in Dallas.

The Lincoln Memorial’s 36 columns were built to represent the states that existed at the time of President Abraham Lincoln’s death in 1865. The architect, Henry Bacon, used stones from Georgia, Tennessee, Colorado, Indiana, Alabama, and Massachusetts, to exemplify the importance of unity. The dates of each state’s admission into the Union are engraved in Roman numerals.

Abraham Lincoln, the 16th President of the United States, is the face on the far right of Mount Rushmore. Joining him, from left to right, are the likenesses of George Washington, the country’s first President; Thomas Jefferson, the third President and co-author of the Declaration of Independence; and Theodore Roosevelt, the 26th President, who led America into the 20th century.

Founded in 1822, Jacksonville, Florida, was named for the first military governor of the Florida Territory, Andrew Jackson. Jackson went on to become the seventh U.S. president, serving from 1829 to 1837, but ironically he never actually set foot in the town that bears his name. Since then, Jacksonville has grown to a current population of more than 840,000 people.

The first President born a citizen of the United States (rather than a British subject) was the eighth President, Martin Van Buren, and one of the founders of the Democratic party. All seven previous Presidents were born before the U.S. became a country. Van Buren was born in Kinderhook, New York, about 25 miles from the state capital, Albany.

As a founding father and the country’s first President, few figures loom larger in United States history than George Washington. A survey by the Census Bureau found that 94 places in the U.S. are named directly after Washington — the most of any person, period. That number rises to 127 when considering spots that include “Washington” as part of a longer name.

Ohio may call itself the “Mother of Presidents,” but when it comes to the second-highest office in the land, its next-door neighbor Indiana takes the spotlight. The state earned the nickname “Mother of Vice Presidents” after an Indiana-born vice presidential candidate appeared on the ticket in 10 of the 13 elections between 1868 and 1916. Despite Indiana's nickname, New York has produced nearly double the amount of Vice Presidents — 11, compared to Indiana’s six.

The White House sits at 1600 Pennsylvania Avenue NW in Washington, D.C., and has been the residence of every President since John Adams in 1800. George Washington selected the site for the White House in 1791. Though there have been many notable renovations and additions to the building over the years, the address of this national monument has remained the same.

As the birthplace of eight Presidents — George Washington, Thomas Jefferson, James Madison, James Monroe, William Henry Harrison, John Tyler, Zachary Taylor, and Woodrow Wilson — it’s no wonder Virginia calls itself the “Mother of Presidents.” But Ohio also has bragging rights as the birthplace of seven Presidents.

Camp David is situated only around 60 miles from Washington, D.C., in the forest of Maryland’s Catoctin Mountain Park. Officially termed the Naval Support Facility, the country retreat was completed in 1938 to house federal government agents and their families. In 1953, the site was renamed Camp David by Dwight Eisenhower to honor the President’s father.