Museum celebrating the achievements of the Soviet space program.

Immortal combat in a Moscow museum.

Moscow's imposing monument to the Space Age.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This massive monument honors the first human in space.

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

One of the world's tallest statues is also one of its most hated.

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

Roman ruins top white travertine terraces formed by ancient hot springs.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.

A tower marking the spot where Yugoslavia began its resistance against the invading Nazis stands neglected, but not quite forgotten.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

Where the lovelorn find a home for their sentimental keepsakes.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This huge metal monument is slowly being stripped to its concrete skeleton.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Yugoslavia's biggest underground airport lies in ruins.

A forgotten and crumbling Yugoslav monument to the victims of fascism.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

Controversial site of what could be Europe's first pyramid.

This historic cemetery was inaccessible for several years due to dozens of land mines.