A long-buried ancient ruin unearthed right in the middle of the city.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

Rows of multicolored bathing huts paint the sand dunes with pops of color.

A Neolithic celestial calendar standing in a nondescript wheat field.

This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

Three sinkholes filled with warm, crystal-clear water reached by a horse-driven cart on an old train track through the jungle.

Legend tells how a Spanish soldier disappeared from this isolated sentry box without a trace.

The ruins of a medieval monastery built on a perilous slope.

Both church and state get put to the torch in this annual festival in the "Bonfire Capital of the World."

A giant roundabout made up of six smaller roundabouts can befuddle the uninitiated.

The steepest classic funicular in the world glides along a dizzying incline.

One of the world's largest pyramids stands within El Mirador, the "lost city of the Maya."

At the base of the Golden Gate Bridge, a small sign basically begs for a high-five.

This once-private estate is now a dreamy, meditative garden that's open to the public.

This enormous secondhand bookstore inside a Victorian train station sparked the "Keep Calm and Carry On" craze.

With nearly double the depth of the Grand Canyon, this Peruvian canyon is one of the deepest in the world.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

A serene desert oasis speckled with ancient artifacts.

A historic Christian shrine nestled within a spectacular natural cave.

A dreamlike medieval church dug into the tuff rock, with unusual carvings and possible traces of the Templar knights.

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

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

An ancient Egyptian temple sits within a modern European museum.