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

Commonly acknowledged as the only public monument to the Devil himself.

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

This lucky bronze frog was gifted to Madrid by a casino.

Inside this church are the alleged remains of the patron saint of lovers, epileptics, and beekeepers.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Every birth, death, and marriage is recorded in these color-coded leather-bound books.

A roadway designed for a visiting monarch.

The colorful stairs are made with marble from the world's major quarries.

This city square dates back to the Scottish Enlightenment and was home to some of Scotland's brightest minds.

A library where thousands of books explain how to avoid another Great Recession.

A former telephone box found new life as a photo booth and charity fundraiser.

Scotland's first Masonic lodge may also be the oldest in the world.

A statue in the heart of Edinburgh honors a bear that served in the Polish military during World War II.

A rare and unique example of an 18th-century door latch calls this restaurant home.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Near the former site of numerous witch burnings, this lavish Edinburgh mainstay pays homage to Scotland's brutal history.

This was once a hall in which a 16th-century royal banquet was hosted by King James VI of Scotland.

360° views of the city plus five floors of optical illusions and hands-on science.

A quartet of brightly colored mythical beasts stand sentry at this gateway.

Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.