A small self-proclaimed micro-state located on a piece of disputed territory between Croatia and Serbia, near Liberland.

Longest fortress system anywhere in Europe.

An apparition of Virgin Mary in Herzegovina.

Bridge that died in war and was resurected.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

Budapest's Communist-era statues, banished to the suburbs.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A fully functional, 200-year-old remnant of the time when Brixton was mostly fields.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

A relic of Victorian grandeur hides beneath a busy South London road.

The remains of Crystal Palace Great Exhibition of 1851.

Abstract dinosaur models in London.

A sculpture of a famous ape who was once a beloved household name in London.