Holy Hindu shrine in an enormous, monkey-filled limestone cavern.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Climb to the top of the world's largest seated bronze Buddha.

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 the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

The celebrated eyesore created by starry-eyed sweethearts.

Gargantuan home of Russian science.

A sculpture park of the tossed aside relics of the USSR, from Stalin to a massive Soviet emblem.

Moscow's imposing monument to the Space Age.

World's largest bell sits on the grounds of the Kremlin in Moscow.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Museum celebrating the achievements of the Soviet space program.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

An incarceration museum on the spot of possibly the oldest prison in England.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

One part local history, 99 parts gruesome haunted house.

Macabre astrological automaton clock dating to the late 1400s.