An ancient Egyptian temple in the middle of Madrid, Spain.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Rare karst landscape eroded from a flat seabed.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A Spanish town built into the cliffs.

Moorish signal station on a stratgic rocky outcrop.

An eccentric collection of antique items shares space with a prop-quality witchcraft museum.

A semi-scholarly approach to sex.

New York's oldest magic store.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

One of the last few places in Manhattan that employed a pneumatic systemic keeps it on display.

Hundreds of antique bank vault locks on display in New York City.

This (occupied) house is 10 feet wide and full of spite.

This quaint archive of the silent era preserves and pays homage to a seminal moment in film history.

A 140-year-old castle with underground caves hidden in San Francisco.

Russian history in San Francisco.

This shop specializes in oddities and Victorian-inspired wonders.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

Over 315,000 preserved amphibians and reptiles in jars.

A store that sells all manner of bones, insects, and animal curiosities.

An amazing collection of fantastic reptiles, amphibians, spiders, and insects.