These azure waters were thought to lead to the Mayan Underworld.

Every equinox this Maya pyramid puts on a spooky ancient light show.

This bleach-white graveyard overlooking the ocean is accessed through a tunnel.

A huge boat-shaped hotel with a blood red pool and other oddities.

One of São Paulo's tight urban intersections has become a haven for graffiti artists ever since a single Batman started the trend.

France's most famous cemetery, with some of its most curious tombs.

Dine amidst exotic plants at this former royal greenhouse.

This museum promotes informed contraception by documenting its often secret past.

Macabre museum devoted to historical Viennese murders.

Handsomely crafted representations of our round planet.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

An isolated village literally built into the crevices and rock formations of a mountain.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A little sculpture with a large wardrobe.

From Tintin to the Smurfs, Europe's greatest graphic icons are celebrated in a grand Art Noveau gallery.

This collection of over 50 murals celebrates Brussels' rich history as the self-proclaimed home of the "comic strip."

A grassy pyramid named after a French battle.

An old department store turned Nazi prison turned artist commune.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.

Berlin's old airport.