This taxidermilogical collection was assembled by a peltmonger turned animal activist.

"The most colorful grottoes of the world.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This 17th-century manor house provides a fascinating glimpse into old-world Mallorcan life.

Mummified monks and the accidentally interred, in a 17th-century crypt.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

This small chapel is built of human bones and decorated with a golden skeleton.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

Artfully arranged bones of 5,800 Austrians.

Thousands of well-dressed mummies below a monastery.

In 1830, cemetery workers in Cham unearthed a chamber housing thousands of skeletal remains from the 13th century, which can still be viewed today.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

In a small churchyard in Dingolfing, Germany the quaint Schusterkapelle is there to remind you of your imminent mortality.

The mystery of the Putim Ossuary involves a tricorn hat.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An Austrian house of bones filled with hundreds of intricately painted skulls.

Europe's second largest ossuary wasn't discovered until 2001.

A section of destroyed vertical lift bridge stands alone in the Peene river.

Several of these strange cone-shaped bunkers can still be seen around the former Nazi headquarters.

One man's personal kunstkammer, museum and shop.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.