Rebuilt remains of a temple to Roman god Mithras.

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

The curios of pharmacist and collector Henry Wellcome.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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

The world's largest collection of witchcraft regalia.

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

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

You can crawl inside this atmospheric 5,000-year-old tomb.

This strange portrayal of the state's first lieutenant-governor literally stands on its head.

The roof of this ancient mausoleum is made from a single Istrian stone weighing a massive 230 tons.

This hilltop ruin is of the hundreds of stone columns built in tribute to the first German chancellor.

The patron saint of spinsters grasps a container of dried blood.

The largest prehistoric cemetery on the Balearic Islands dates back over 2,500 years.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

You can row a boat through this ancient underground reservoir.

Dozens of vintage puppets are displayed in an unassuming hallway at the public library.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

An enigmatic sculpture depicts a ruined home with debris stretching for over half a mile along the river.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."