At 1,732 feet above sea level, this spectacularly isolated yet surprisingly bustling bar is the highest pub in Britain.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

This unusual piece of Renaissance art depicting the bodily horror of crucifixion and skin disease may have been inspired by fungus-induced hallucinations.

Balconies that have a most unusual accent.

This demon atop the Notre-Dame de Paris looks utterly bored.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This enormous "cloth of the conquest" depicts the Norman invasion of England in mind-blowing detail.

An unusual number plate signifies the building's saucy past.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

BDSM, 1930s Style.

This innocuous-seeming building is actually the remnant of a major wartime brothel.

Museum in a swimming pool where the water still flows.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

This museum in a Paris apartment gives a unique look at the iconic French singer's life.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

A modern-day Lascaux cave underneath Paris.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Ancient paintings known as the "Sistine Chapel of Cave Art."

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

What if all public housing projects had been designed by "the Pygmalion of modern architecture," not only their prototype?

This home on a quiet suburban street is completely covered with vibrant mosaics.