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

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

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

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Op-art architecture designed for happiness.

The first fresco Diego Rivera painted in the United States can be found in the former San Francisco Stock Exchange.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

An interactive exhibition space dedicated to the kinetic sculptures of Swiss artist Jean Tinguely.

Constructed along the shores of Lake Zurich, this pavilion is a walk-through work of art.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This historic hotel invented the chocolate brownie.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

The only museum with its curator—and her pets—buried inside.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.