This futuristic German television spire is actually the world's largest digital clock.

A lone gunner's station is all that remains of a replica Spanish Fort in Florida.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

Touching mementoes from those who didn't make it back from World War I still hang in one of New York's oldest bars.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

This Wall Street bar was once a hub of revolutionary activity where Washington famously bid farewell to his troops.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

A sacred well steeped in Pagan roots on the West Coast of Ireland.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Architectural monsters are devouring this palace's every door and window.

This historical swimming pool near Miami is emptied and refilled each day with naturally filtered water.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Costumed elves and mountain bikers co-exist peacefully at this abandoned Christmas-themed adventure park.

The Habsburgs' royal collections of art and wonders.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.