This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

An autonomous republic of Orthodox monks.

The hermits of Karoulia protect their asocial lifestyles by living on the vertical face of a treacherous precipice.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

Thousands of rusting train cars have been slowly falling apart on the edge of Greece's second largest city.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

Check out engineering marvels of the past at this unintentionally retrofuturist museum.

A celebration of all things tacky, garish, and bizarrely creative in the Romanian capital.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

Operating continuously since 1903, this "milestone" facility transformed the regional economy.

Structure built from the skulls of vanquished foes.

Brawny guys rolling around in oil is the oldest regular sporting event besides the Olympics.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A plaque marks the underground site of one of London's "lost rivers."

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

This picturesque mansion has gone from opulent ruin to nature museum.

An elegant chandelier hangs over this ancient sewer chamber, now open for concerts and public tours.

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

The last four extravagant street signs of London's historic banking street.

Ship-sized kinetic sculptural fantasy.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.