This abandoned prison castle has become an imposing gallery of graffiti art.

What was once a summer home next to a waterfall has now become littered with graffiti and children in swimsuits.

Come for the fried chicken, stay for the history at Oklahoma's oldest bar.

Over 50 historic windmills whir away at this outdoor museum.

This historic theater's pipe organ still accompanies silent films just like it did in 1929.

Circus cemetery for all the “showmen under God’s big top.”

The site where the Spanish first landed in Mexico was once a thriving Mesoamerican city.

This atmospheric ruins are truly a sight to behold.

The eclectic home of a leading Turkish architect is a gorgeous piece of eye candy.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A meow-velous tribute to a beloved street cat, made famous on the internet.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

This eatery re-creates dishes from the Ottoman Empire so you can dine like a sultan.

Walk through Czech history in Prague's largest graveyard.

Countless grotesque faces stare out from this eerie Prague art wall.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Two stunning 17th-century libraries and a cabinet of curiosities.

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

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

Cherry blossom season comes early in this Japanese town where pink flowers line the streets and riverbanks.

This lovely tree was a thank you gift from the man known as "Public Enemy No.1."