Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

A peculiar family mausoleum built by a German nobleman captivated by the occult.

This lesser-known geographic marker was the reference point for all surveys of the continent for 75 years.

This stone in Lake Geneva was once the reference point used to determine altitude in Switzerland.

This small bronze pyramid marks the center of Belgrade, but some say it is a Masonic symbol.

This historic Art Nouveau townhouse was the former home of the son of a famous chemical inventor and industrialist.

This 18-foot-tall public art installation is another of sculptor Thomas Dambo's trolls.

This Tudor-style mansion is home to the first roadside confectioner in the United States.

All that remains of the Whittall mansion are the ruins of the formal garden and its pergola, dedicated to the late Matthew J. Whittall by his widow.

One man is on a singular quest to name an island after a famous hip-hop artist.

This memorial is dedicated to a once popular but now defunct discount Shrewsbury department store.

A giant scrap metal troll rests his hands on top of a dilapidated building covered in graffiti.

Legends, sculptures, and unique tombs can be seen lurking in these connected cemeteries.

Nature’s skyscraper launches out of the terrain with attitude.

This nearly abandoned plantation was once witness to an eclipse that proved Einstein's theory of relativity.

The equator passes through this tiny island in the eastern Atlantic.

This fertility idol of questionable authenticity inspired an iconic Indiana Jones artifact.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

Through the decades, Black music stars have performed at this historic hub for music and the arts.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

A derelict bit of infrastructure from the canal that once ran through D.C. is landlocked in the heart of the city.

A hidden passageway now marks the site of an assassination attempt on Ronald Reagan that some say broke a 140-year-old curse.

The fountains of the U.S. Navy Memorial are annually salted with water from the Seven Seas as part of a nautical ritual.

Where you can hail your favorite fictional commanders-in-chief.