Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

The mortal remains of a Russian prince, priest and paranormal investigator who came to America in 1792.

Behold the rickety wooden glory of the world's oldest operating roller coaster.

This dramatic rail curve was once the target of a failed Nazi attack.

This nearly invisible wire transforms much of the city into one big, symbolic home on the holy day.

The falls were named for the mistaken idea that they were the ones pictured on the Canadian $5 bill.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

A benevolent, 16-foot-tall river dragon lives on a suburban lawn.

Once the most densely populated place in the world, this island is now a ghost town.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A diminutive plaque recalls the treetop sniper who almost killed Abe Lincoln.

Under a playground is a little-known sealed train tunnel that likely contains the bodies of workers trapped by cave-ins.

These disused steel furnaces are now haunting ruins that may one day be a national park.

This leafy estate is worth $18 million and is so grand it has two mailing addresses.

An obscure federal monument honors the French diplomat who served as Ambassador to the U.S. during WWI.

Cold War intelligence agents monitored communist embassies from an attic in a former pigeon coop.

A small triangle of DC grass is the final resting place of one of Sonny and Cher's songs.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

These recently uncovered walls are all that's left of Washington, D.C's first defense contractor.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

This massive swimming pool is the high tech home to the human-powered submarine races.

The largest earthwork effigy in the world.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.