London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A spitting ode to a German serial killer.

Böttcherstraße's bells, extolling Nordic virtues and the great conquerors of the world.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

An artificial hill and apparent calendric structure built in the Early Middle Ages immortalizes a legendary Polish princess.

This man-made mound monument was built out of soil from all across the Polish empire.

Breathtaking and huge 430 year old maps of Italy.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Where the lovelorn find a home for their sentimental keepsakes.

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

Visit the monolithic tomb of America's most famous general.

Elevated freight railway turned wildly successful urban park.

The oldest known university in the world is in Fez, Morocco.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

Traditional 11th-century outdoor tannery.

Crumbling necropolis set high above Fez.

The other side is actually green.

Mosaics, storks, and brothels—this ancient city has it all.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Underneath the city that invented pilsners are a series of historic tunnels that have been storing beer for centuries.

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