A student driver's nightmare.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

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

The most visited, and possibly most controversial, museum in Germany.

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

Started as a kitchen garden, now the second largest botanical garden in the world.

A swing to dangle you off the very edge.

Macabre astrological automaton clock dating to the late 1400s.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

The fairy tale castle of the "fairy-tale king."

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.