Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

An ethereal glowing blue ocean cave in Croatia.

The ornate miniature mansions were built for Istanbul's feathered residents.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

Climb atop one of the world's longest and heaviest trains for an unbelievable journey across the Sahara Desert.

This is what trains will look like after the zombie apocalypse.

A lonely beacon, precariously perched atop a remote sliver of rock.

This meticulously extracted nervous system allegedly came from a 19th-century custodian who donated her body to science.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

At this Oaxaca contest, artists turn purple produce into stunning depictions of saints, buildings, and La Pietà.

Every Easter, a small Sicilian town builds a stunning cathedral out of bread.

Every year, the town of Menton, France, turns lemons and oranges into giant sculptures depicting windmills, dragons, and more.

This spectacular bridge supported by two gigantic hands looks like something out of a fantasy universe.

One of the most controversial statues in Romania is an emperor with no clothes.

This snug medieval lane is one of the narrowest streets in the world.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

To enter the lower hall of this temple, you must first walk through a dragon.

Micro-nation based around a nine-story high illegally built tower.

A little-visited waterfall in an otherworldly landscape.

A muddy alien landscape that is home to rare species of exotic plants.