A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

"The most colorful grottoes of the world.

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

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

Terrifying derelict military hospital once housed a recuperating Hitler.

One of the last Jazz Age "Wonder Theaters" in New York City.

The unbelievably opulent home built for an infamous newspaperman.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

A part of the world's largest marsh seems to be growing bright red Martian grass.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Abandoned concert venue legendary for its rock counterculture.

This floating garden in the sky is straight out of a fairy tale, but the real thing is nothing short of magical.

World's largest cave was only discovered in 1991, and now offers tours to the public.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

A magically clear, blue river that seems to spring from nowhere.

The highest bridge in America was built for an almost unnervingly small amount of money.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Neither Spanish settlers nor anyone since has been able to tell who built these strange California rock walls.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

Dozens of lights dangle from the branches of what may be the brightest tree in Los Angeles.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.