An abandoned saucer-shaped monument in the Bulgarian mountains.

Romania's triumphal arch looks out over Bucharest.

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

Nikola Tesla's ashes are held in a golden sphere, surrounded by his works.

A futuristic, brutalist masterpiece that is also strangely prison-like.

Where the lovelorn find a home for their sentimental keepsakes.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

Structure built from the skulls of vanquished foes.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.