More than 140 granite sculptures decorate the lawn of this French sculptor.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Ancient Greek oracle of the dead.

Monasteries on rock pillars, once accessible only by frayed ropes.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Built to repay the sins of the father, this church is home to one of the most valuable works of Western art.

100 year tradition of fist fights, marked by marble footsteps.

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

Go inside to really appreciate this 500-year-old technological masterpiece.

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

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

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

The history of radiation is on safe display at the foot of a radiation science laboratory.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

A museum which takes visitors to the côté obscure of Paris.

A font of vintage porn on the silver screen.

Museum of science fiction, utopias, and extraordinary journeys of the mind.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

A famous burial ground with a history both grim and literary.

A quiet memorial to those who died saving others in the heart of the City of London.