A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Mountain where Jesus was first tempted by the Devil.

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

This semi-secret storybook hedge maze is also the oldest garden in the city.

A beautiful but toxic fountain of mercury.

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

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

A small memorial to a deadly night in Serbia that shook the world before it was swept under the rug.

A misnamed well, with a deep dark past.

A pair of connected skyscrapers form this symbolic gateway.

Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

300-year-old villagers houses and traditional churches preserve a nearly lost piece of Russian history.

A 360 degree battlefield experience.

A model village fit for an emperor.

Russia's own leaning tower was built on a tragic historical fable.

Gargantuan home of Russian science.

A monument to the defenders of the Arctic in Murmansk, Russia.

Stalinist skyscraper built with help of cryotechnology.

Church built on the site where the last tsar of Russia and his family were killed.

A small part of Russia that does not touch any other part of Russia.

Hidden in a metro shop under a shopping mall, this small museum tells the story of one of the world's largest urban transit systems.

The tallest hotel in Europe.

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

Moscow's most popular cemetery includes the graves of numerous cosmonauts.