A walk through the historic city center, under the streets of Seattle.

A museum dedicated to the history and exploration of both popular music and science fiction.

The first park built over a freeway is a brutalist masterwork.

From a neon Rapunzel to a bike traffic meter to a street fair color scheme, the most opened drawbridge in the US is a veritable art gallery.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

Flashy signs from Las Vegas’s past find their final resting place at this unusual graveyard.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

One of the world's smallest prisons boasts just two small cells.

The first island in the world designated a light-pollution-free astronomical observation point.

An 800-year-old island castle in Guernsey's main harbor.

Underground hospital complex constructed by slave laborers during the German occupation of the Channel Islands.

An intricately decorated tiny place of worship.

A 1970s resort city now stands abandoned, caught in the middle of a divided island.

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

Looking for a unifying history, Uzbekistan finds its answer in a 14th Century Turco-Mongol conqueror... despite the fact he wasn't Uzbek.

A monument to the bloody fight against fascism in Slovakia during World War II.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

An ancient necropolis of magnificent tombs.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Home of the infamous Cauld Lad of Hylton and one of the inspirations behind "Alice" in Sunderland.

According to local legends, a monstrous worm once wrapped itself around this hill by the River Wear.

This now museum began supplying water to Sunderland during the mid-19th century.

The former "holiday home" for monks at the Durham Cathedral.