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

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

Overlooking the burial ground is a tower designed to prevent thieves from snatching the recently deceased.

The artist David Nash planted a circle of trees in 1977.

The marble facade hides a little-known medical museum with early surgical instruments and rare copies of canonical texts.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Solitary monument dedicated to the beauty of nature.

Museum precariously perched on a massive yellow pillar.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

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

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Elaborate tile work in this railway station tells the story of Portugal.

This restored Portuguese cafe may well be the most beautiful place in the world to grab a Big Mac.

This attraction is devoted to the wonders of steam power and features a replica of one of its most public disasters.

Ancient catacombs form the foundation for this Rococo orgy of a church.

The stunning interior of this Gothic church is covered in ornate gold details.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

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

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

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

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

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