This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This once-derelict building is now one of the most beautiful bookstores in the world.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

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

A misnamed well, with a deep dark past.

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

A pair of connected skyscrapers form this symbolic gateway.

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

This futuristic German television spire is actually the world's largest digital clock.

Twisted buildings adorn the banks of the Rhine river.

A cluster of headless, armless sculptures looms within a popular Polish park.

An abandoned football stadium with a tragic past.

These mechanical goats first battled it out in the year 1551, all because of an overcooked deer.

An impressive monument to Poland's independence.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

Morocco's largest Jewish cemetery.

This restored eighth-century palace is a shining example of ancient Umayyad architecture.

This exceptionally well-preserved ancient marvel also houses a small museum dedicated to Jordanian folk tradition.

The jaw of one of humankind's earliest ancestors on display at an overlooked geology museum.

The only microgravity tower in Europe can produce nine seconds of weightlessness.

Amsterdam's former hotspot for public executions and dissections.