Where commuters walk through remnants of an ancient Greek necropolis.

Preserved portions of Athens's ancient defenses are on display in a subterranean parking garage.

An icy lake tucked among jaw-dropping alpine panoramas.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

Collection of fossils, plants, and ancient animals encased in amber.

Did the legendary Scottish knight William Wallace actually take refuge here after a major battle?

The recurring nature of this geographic feature might make it unique in the world.

No other place in Scotland has such a high concentration of prehistoric carved stone surfaces.

The ruins of Scottish sea salt production.

Inside this art museum resides one of Glasgow's most famous musical instruments.

This vintage gem is one of the oldest surviving purpose-built movie palaces in Scotland.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A scattered trail of street art adds a pop of color to the city's stark structures.

This bridge over the River Cuale leads to a neighborhood that was once an escape for Hollywood's elite.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

This collection of Neolithic monuments make up one of The U.K.'s richest archeological landscapes.

This Neolithic-era complex boasts standing stones, a cairn, and the only henge in Western Scotland.

This lovely Scottish nature walk leads to the source of a local legend.

This uniquely shaped rock formation is one of Scotland's most iconic mountains and gives spectacular views in all directions.

This public library still showcases its former life as a 19th-century church.

The unexpected mascot of Shetland's capital.

This man-made waterfall was designed to help improve access for spawning salmon.

This memorial celebrates the legacy of the British-Norwegian resistance movement during World War II.