A small Richmond island dotted with the remnants of hundreds of years of history.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

The final resting place of two (or three) presidents, one vampire, and 18,000 Confederate soldiers.

Memorial stone for GWAR vocalist, depicted in his iconic costume.

The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

An architect transformed this abandoned cement factory into his castle-like workshop.

This 50-ton ship on Orcas Island has never seen the ocean.

A bizarre roadside attraction and the first instance of miniature golf in the world.

A mysterious echo seems to defy the laws of acoustics.

The television series' iconic giant foot was borrowed from this classical painting.

An alternate history park where the Union Army loses the war... to dinosaurs.

A silly medieval mural preserved on the side of a Viennese house.

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

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

A Spiritualist house of worship where believers communicate with the dead in the spirit world.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Four bald cypress trees in Lafayette Square, across from the White House, mark the southern edge of a 100,000 year old cypress swamp.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A hidden gem on the lawn of the U.S. Capitol Building designed by landscape architect Frederick Law Olmsted.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

Hidden in plain sight on the Hudson River is an abandoned train station where nature has taken over.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Once America's longest-manned military fort, now an abandoned hulk.