This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

An eerie collection of the surviving structures from a past celebration of the future.

Hidden behind a wall, Spanish nuns distribute their signature sweets on a revolving tray.

Single runway interrupted by a busy road that cuts across its middle.

This small chapel is built of human bones and decorated with a golden skeleton.

This charming candle shop has been in business since 1789.

Entire apothecaries are on display at this Lisbon museum, which explores the history of medicine.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

Eat the ultimate iteration of Portugal's most beloved pastry.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's oldest bookshop still in operation.

This sculpture pays homage to the street sweepers of Madrid since its inauguration in 2001 in Plaza Jacinto Benavente.

A haven for book enthusiasts across the street from Retiro Park.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

A lush indoor jungle fills this bustling Madrid transportation hub.

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.

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

France's national museum of scientific and industrial instruments.

A mechanized clock where a man fights off a dragon, crab, and rooster.

A museum of carnival attractions where you are invited to ride the rides.