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

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

Giant marble phalluses on the sacred island of antiquity.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A spectacular cave and a beguiling lake.

The hallucinogenic center of the ancient world.

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

Four alabaster giants contemplate the tides on the shore of Denmark.

The world's largest maze is a nature park with nearly 200 decision points.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

Vortex-shaped aquarium hosts Europe's largest school of piranhas and other ocean creatures.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Sweden's "good old days" painstakingly re-created in a model village.

Stockholm's deepest subway station is also a stunning ecological wonder.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

Legend says this fabled well held part of a mythical Norse tree.

An unsettling painting of three faceless sisters that is surrounded by history and legend.

The Sighignola summit on the Swiss border offers views so breathtaking it's been named one of the most beautiful places in Italy.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

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

This amazing oasis of art and plants is hidden on the outskirts of Marrakesh.