Double spiral staircases are not unheard of, but they are very rare.

Resting in the middle of an Austrian river, this sci-fi "island" lets people cross in neon style.

This elephant kraal is the only one remaining in Thailand, dating back to the 16th century when these massive mammals were integral players in war and trade.

The golden Buddha statue at the Wat Muang Monastery is the tallest in Thailand, and the ninth-tallest in the world.

A Buddhist shrine in a cave protected by macaques next to dark passages lined with creepy paintings.

Monkeys lounge around at this 13th century temple.

A lush indoor jungle fills this bustling Madrid transportation hub.

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

Over two centuries old and counting, Madrid's massive botanical garden contains one of Europe's only desert environments.

A whimsical brother of the nearby Fallen Angel statue takes the falling part quite literally.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

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

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

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

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

The London statue that imitates passersby.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

The remains of this misplaced church were moved here stone by stone.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

Memorial to the lost dead of Gdansk, whose resting places were destroyed during World War II.

A mysterious emblem tucked in an small alleyway is actually the coat of arms of a heroic medieval family.

This 700-year-old structure is one of the most unique architectural and historic monuments in Gdańsk.

The site of the first battle of World War II.

A hyper-remote desert cave dramatized in "The English Patient."