Thirty creepy ghosts now inhabit this decaying 14th-century church.

The world's largest collection of intentionally useless inventions.

A dormant lightning machine equal to all the power in Russia.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

Large Hadron Collider and the Birthplace of World Wide Web.

A church of bones, decorated with 40,000 human skeletons.

A Jenga-style cylindrical tower of books that appears to go on forever.

Museum in a swimming pool where the water still flows.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.

When the rain falls, this drain system turns into a musical instrument.

A musical instrument played by the sea.

When you're a great Russian Tsar, even your vomit gets a statue.

A visionary precursor to the Internet made of index cards.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

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

Notorious artist squat renovated into legal studios.

Each spring, a dreamlike carpet of bluebells overtakes the forest floor.

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

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

The beautiful baroque library of the Hapsburg empire.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Monasteries on rock pillars, once accessible only by frayed ropes.

The final resting place of New Orleans' most famous voodoo priestess.

A collection of haunted artifacts chronicles the career of the world's most famous paranormal investigators.