This derelict superstructure was a very important warning system for the Soviet military.

The largest catacomb system in the world.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

One of the tallest waterfalls in Africa is also home to a population of monkeys who enjoy the waters and the occasional guest.

Founded as a refugee camp, now a popular tourist spot.

This towering statue of Jesus provided internet to the surrounding area.

Morocco's Argania trees are infested with nut-hungry goats.

Rocky Atlantic beach home to a stunning stone arch.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Houses are tucked between, on, and underneath giant boulders.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

The world's largest collection of intentionally useless inventions.

An abandoned mine now resembles a post-apocalyptic landscape of derelict buildings and blood-red pools of water.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.