The ruins of the first mountaintop observatory are just a hike away.

This unique rock formation is quite the local celebrity, although one day it may come crashing down.

According to the Guanches, the aboriginal people of the Canary Islands, the king of evil lives inside this volcano.

A large collection of solar and night-time telescopes dot a small area on the Teide mountain range.

Built in the Soviet era, this cableway system still runs gondolas from Odessa down to Otrada Beach.

The eerie burnt-out remains of a prominent building where 30 protestors lost their lives.

The largest catacomb system in the world.

Padlocks cover this rickety footbridge with love.

An artful memorial to 4,000 fateful oranges.

Featured in one of the most iconic scenes in cinema history.

Rest stops along this pathway offer some of the best views of the Acropolis of Athens.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

Monasteries on rock pillars, once accessible only by frayed ropes.