A sea cave with a waterfall and Viking past

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

This Shetland Islands bus shelter may be small, but it squeezes in a couch, a desk, some art, and even an old telly.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Possibly the oldest of Britain's ancient henges is also one of its most stark.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

These fantastically named natural pools look like something out of a Scottish myth.

The star-studded street honors the city's most notable Brummies.

A open air theatre built on a cliff by an eccentric British woman.

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

A 19th-century British industrialist built this Louis XIII–inspired chateau for his homesick French wife.

This no man's land slicing through the island is strewn with abandoned relics of another time.

An ancient necropolis of magnificent tombs.

The ancient mosaics here are considered among the finest in the world, and serve as a stunning record of Greco-Roman daily life.

One of the world's tallest statues is also one of its most hated.

Gargantuan home of Russian science.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

A vast Communist-era exhibition space in the Bulgarian capital.

An homage to the medieval rulers of Bulgaria.

Sofia's legislative center is continuously reinventing itself.

"Holy Wisdom" overlooks the city that became its namesake.

A striking symbol of the Bulgarian capital.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.