This crumbling, graffiti-covered mansion sits tantalizingly within reach of the proletariat who frequent a public park.

The last bastion of Roman presence north of the Alps looms over a German town.

A unique underground structure dating back to the 1st century BC.

Visit the monolithic tomb of America's most famous general.

Recovered suit of a cannibalistic West African gang.

This New York holdover was built to provide housing for shopgirls and still does not allow men above the lobby.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

The last remnants of what was once one of the world's grandest hotels can now be found in a Manhattan subway station.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

The mass grave of a heroic Revolutionary War regiment sits below an empty lot near the Gowanus Canal.

The world's largest boar is a huge steel titan found at a French rest stop.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

Monument to a forgotten NYC disaster that claimed the lives of 1,000.

This impressive mansion in Vinegar Hill has some mysterious details in its architecture.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

Detailed facade of a brownstone in Boerum Hill.

This 19th century brick building in Brooklyn stands out like the anachronistic landmark that it is.

Play heads or tails with thousands of different coins.

The oldest house in Manhattan is now a museum that remembers the home's sordid history of scandals, vice-presidents, and ghosts.

This luxury shopping lane has been protected by its own tiny police force for over a century.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

A little piece of Paris in the sultry south of the U.S.

This New Orleans statue of a portly figure in a goofy hat pays homage to a classic of satirical literature.

This historic Melbourne bullet factory is fully encased in a massive glass and steel cone.