This remarkable cave was discovered after a shepherd watched bees enter and exit through a small fissure.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

Perched on a spindly rock spire in a Greek archipelago, this lighthouse would make a perfect wizard's tower.

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

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

The ancient sauropod tracks found in this former quarry are some of the largest in the world.

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

These small, triangular, colorful houses are a staple of Madeira Island.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

Rainwater transformed this old quarry into a peaceful pond you won't find in most tourist books.

A micronation on an islet along the coast of a Portuguese island.

The medieval town's star-shaped walls are geometrically dazzling, though not entirely impenetrable.

A lush oasis full of vibrant plants and striking geometric displays.

Perhaps the most spectacular grotto along the Algarve coastline.

A perfectly circular lake is formed by the crater of an ancient underwater volcano.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

An early work of the architect Álvaro Siza Vieira, these swimming pools blend into the beach.

A small Portuguese cottage formed between boulders in the countryside.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

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

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.