The hallucinogenic center of the ancient world.

The palace of the King of Kings, burned by Alexander the Great.

At the United Kingdom's only residential library you can sleep among the books.

A painfully obvious spy house sits right across the street from the Russian Embassy.

An unfinished tomb carved into a giant boulder in the Arabian Desert.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The only diamond mine in the world where you can keep what you find.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Leave the wardrobes and sweets to British schoolchildren, Shanghai's got a Coke machine that leads to booze.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

This innocent-looking townhome is actually a subway exit.

A mysterious light floating in the trees of Arkansas may be a piezoelectric effect.

This was once the home of Gahan's Saloon, Denver's most storied speakeasy.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A technicolor place of worship for Elevationists.

This modern antique shop is a museum for 1980's Saturday morning cartoon culture.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

Once a mortuary that held the remains of Buffalo Bill, this Denver hotspot is now a death-fixated restaurant.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

A stone arch leads to a cavernous 1930s spring house tucked away in the Pennsylvania woods.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

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