This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

This Soviet-era athletic and recreation facility is the highest ice skating rink in the world.

The largest prehistoric ruins south of the Sahara, once a powerful center of international trade.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

A museum marks and documents the site of the Titanic's launch.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

The shockingly unspoiled Peruvian tomb of the Lord of Sipan was once guarded by a footless warrior.

The world's second-tallest flagpole stands proud despite dropping rank.

The Avenue of Mausolea is a series of grand palatial tombs.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

Romania's triumphal arch looks out over Bucharest.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

Two churches shoot bottle rockets at each others' bell towers in an unusual Easter celebration.

This ominous Albanian fortress houses tanks and downed planes as a reminder of their victories over Western imperialism.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

This single room has survived the centuries with almost no deterioration.

A wild Hollywood resort thwarted by mosquitoes.

The Guardian of Tallinn.

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

Macabre astrological automaton clock dating to the late 1400s.

A solar-powered primary school inspires hope and experimentation in a country ripe for energy innovation.

What happens when you cross a mayor and a painter?