The fifth-longest natural arch in the world, and the longest outside China.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

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

Catch a ride through the Pennsylvania countryside on this historic narrow-gauge railroad.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

A Dutch museum preserves the world's most diverse collection of vertical slices of soil.

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

An intricate and amazing house built by architect Karl Junker.

A home designed to be on the cutting edge of comfortable, low-cost living.

The one-time office of the architectural firm that ushered in the Gilded Age is now a Club Monaco.

A small part of lower Manhattan is actually made from a bit of England.

Site of the first pathological and bacteriological research facility in the United States.

The mummified relics of an American missionary.

Elevated freight railway turned wildly successful urban park.

A surprising, but overlooked example of geology in the middle of the nation’s capital.

The first memorial dedicated solely to the Black troops who fought for the Union.

"Congress may voluntarily remain in session throughout the summer, in order that our Congressmen may be protected from the intolerable discomforts and dangers of the ordinary outdoor weather!”

A favorite haunt of Delhi's politicos and intellectuals, this old-school coffee shop was shut down under Indira Gandhi's Emergency.

Built in 1815, the stabilized ruins of the grist mill and sawmill are now gated, but interpretive displays on the features and functions of the mill preserve its history.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

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

A fairytale art house in the middle of Wisconsin.