This late-brutalist masterpiece everyone forgot about was originally created to get the proletariat jazzed about the arts.

Russia's giant concrete QWERTY keyboard is likely the largest in the world.

Church built on the site where the last tsar of Russia and his family were killed.

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

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

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

This star-shaped military outpost is now simply trying to protect itself from neglect.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

This cemetery features modernist statues as strange as its name.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A fantastic castle rumored to be the birthplace of King Arthur.

A monument to the love people have for their pets.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

Foreign invaders almost left this lovely Caucasus palace alone—almost.

This Armenian monastery was carved out of cliffs and named after the spear used to stab Jesus.

The most visited pilgrimage site in Armenia once held a saint in a pit for 13 years.

Resonant stone, that has been played since prehistoric times.

Home to nearly a third of the world's mud volcanoes, Azerbaijan is home to a messy, bubbling, and sometimes explosive landscape.

A gigantic collection of teeny, tiny books.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.