The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

A tiny Greek Orthodox church from the Ottoman era hides on a busy city street.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

Ample proof that watery ends make for well-preserved, millenia-old mummies.

The ornate structure is part of a building boasting more marble than the Vatican.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

Largest lake in Great Britain measured by surface area.

A mysterious ruin shrouded in more folklore than fact.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

The strange behavior of a tween led to allegations of witchcraft and a curse being placed on anybody within earshot.

This volcanic plug boasts the longest recorded history of any Scottish stronghold.

This Scottish bridge seems to compel dogs to leap to their death.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

Hidden on a cobblestone street in Glasgow, a Czech Cajovna-inspired teahouse serves as a hangout for Bohemians.

One of Scotland's most important modern structures, it just made the '100 Most Endangered Sites' list.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

This luxury shopping lane has been protected by its own tiny police force for over a century.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

This overlooked street light once served as a KGB dead letter box.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This historic Chinese tower was said to have been haunted by fox spirits but is now haunted by a grisly murder.