Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

The world's largest collection of intentionally useless inventions.

A centuries old castle atop a dormant volcano houses museums devoted to both women and witches.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

The topiary maze at the Habsburg hunting lodge.

This former insane asylum now holds a pathological anatomy museum.

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

The beautiful baroque library of the Hapsburg empire.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

Festival of Perpetual Life and Rebirth.

A unique hotel for the artistic soul.

One of the largest barracks of the Austro-Hungarian monarchy's military is now an abandoned ruin.

The home of a deceased Hungarian artist is now on display for visitors.

Hungarian self-built castle.

Museum dedicated to the terror regimes of Hungary.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Inside a former cabaret, seven floors of erotic art.

Paris' linguistic guide to the international language of, yes, love.

This Parisian fountain is a little bit fantasy and a little bit nightclub.

This museum houses an imposing skeleton army comprised of creatures great and small.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.