A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This apartment is a true time capsule of local life in Bulgaria during the Soviet regime.

The 1936 Summer Olympics site is a crumbling remnant of sportsmanship and a history its host country would like to forget.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

This sublime architectural marvel is a rare example of an expressionist church.

This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

Hackney's newest private museum and natural curiosity shop.

The world's oldest family-run magic shop is hidden beneath a bustling London thoroughfare.

This intricately carved and hilariously huge bed was such a famous symbol both Shakespeare and Byron used it in their writing.

This secluded walkway overlooks a magnificently wild London green space.

This iconic high-rise residential block was one of the last to be built in the Brutalist style.

Art Deco and “Wrenaissance” mash-up, this recently restored royal residence has been home to kings and comes with secret monkey passages included.

Explore nearly 400 years of English middle-class home life.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

Repository for more than 22 million pickled specimens.

A cluttered and astounding collection of antiquities and curiosities.

Eighty million natural history specimens call this gargantuan museum home.

The anatomical-pathological collection of a man who changed surgery.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The curios of pharmacist and collector Henry Wellcome.