This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

A hollow cement depiction of time's inexorable effect on the human body.

The incredible private taxidermy collection of an eccentric zoologist.

This early Norman castle was the first historical monument protected by an act of Parliament.

"The Most Wonderful Wonder that ever appeared to the Wonder of the British Nation."

The name of this suspended sculpture is Latin for "high horse," which is exactly what it is.

This sculpture of Edward of Woodstock is surrounded by eight Victorian lamp bearers.

In a small courtyard resides this large mural that draws inspiration from Leeds and its history.

This Victorian graveyard in Leeds is a macabre collection of beautiful tombs and memorials.

The last gas-lit cinema in the United Kingdom, and perhaps the world.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.

France's most famous cemetery, with some of its most curious tombs.

Tucked in a nondescript downtown Brooklyn mall is a bar containing a remarkable turn of the century anatomical wax collection last seen in 1920s Berlin.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

This house's itty bitty size means no humans allowed.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The house where the writer spent his formative years.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

This former insane asylum now holds a pathological anatomy museum.

One of the best collections of wax anatomical models in the world.