Despite monuments in other locations, this spot in a South Dakota field is recognized by the U.S. National Geodetic Survey as the center of the 50 states.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

These giant metal horses graze on a hilltop near the Montana highway.

A man's home is his castle.

The capital of the Cayman Islands is a center of offshore banking, but gets battered by blistering hurricanes.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

Site of the 1926 murder trial of Ernest Burkhart who was involved in the "Reign of Terror."

The only fully-realized skyscraper built by the famed American architect, Frank Lloyd Wright.

An oil baron's wild paradise and the winner of an ill-fated air race.

A tribute to Ponce de Leon's supposed quest for eternal youth.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

A 1,100-ton train fell through the floor in 1953. Workers got it patched up in just 72 hours.

A historic arena where the Beatles played their first concert in the U.S.

An oft-overlooked, magically musical monolith that stands majestically between Arlington Cemetery and the Iwo Jima Memorial.

At 207 feet, one of the world's longest continuous escalators.

A tiny monument to the unsuccessful attempt by Thomas Jefferson to place the prime meridian in Washington.

Look closely and you’ll notice that the color changes a third of the way up the tower.

This sandwich shop has a century-old elevator behind a sheet of plexiglass.

Legend has it that President Grant’s frequent drinking in the lobby gave rise to the term “lobbyist.”

This poor little statue is the most vandalized memorial in Washington.

Perhaps the most scandalous statue of America's first president.

There’s a hidden military meme engraved on the World War II Memorial.