This giant boulder is sandwiched between apartment complexes in upper Manhattan.

The "Seinfeld" diner.

Bananas are often left for the first monkey America ever recovered alive after being launched into space.

Like something out of a pulp adventure, this abandoned plane wreck is slowly being retaken by the Caribbean jungle.

The floor of the oldest surviving synagogue in the Americas is entirely covered in sand.

A sanctuary for sickly, stray, or wounded donkeys.

Shipwrecks, ruins, and turtles are all that remain on this haunting Caribbean ghost island.

A Wild West jailhouse that slid down the mountainside.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

These boots are made for selfies.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Once the home of a hermetic monk, this cave now houses a small church.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.