A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

This impressive collection of rare books on ancient mysticism inspired author Dan Brown.

The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

This World War II-era bunker hides between medieval chapels in Nijmegen's city center.

An eccentric home in Sicily turns heads on a regular basis.

A pride of the state, this working museum crafts pottery mosaics in the style of Pennsylvania's earliest European settlers.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Contrary to popular belief, this secluded statue doesn't represent Pennsylvania's founder.

This hidden gem of a garden has one of the only surviving Victorian ferneries in America.

A madman's personal garden filled with 1,000 sculpted heads.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.