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.

This 600-year-old home seems to defy physics.

This grisly headstone doesn’t seem to be resting in peace.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Colorful boxes placed over the dead are left to rot and crumble.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This WWII-era military installation once held an entire city within its walls - now, its walls are falling down.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

A suburban street in Anchorage doubles as a runway, and each home has its own airplane hangar.

A high school astronomy enthusiast designed this model of our solar system to be traversed on foot.

Light bulbs, scrap wood, and tinfoil comprise this homemade throne of the gods.

Eighteen miniature death-scene dioramas.

An eerie, decaying ghost town destined to fade into the forest.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

An FDR-era tuberculosis sanatorium has stood abandoned in the suburbs of the U.S. capital for over 30 years.

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

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

Catacombs turned marketplace.

An Industrial Revolution-era public work that purified water using nothing but sand.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

Obscure Freemasons still live in D.C.’s largest private residence.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.