An ancient iron pillar in Delhi that seems to be rustproof.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The world's second-largest sundial, made entirely out of stone.

The country's oldest continually-operated mini golf course lies hidden in plain sight, eclipsed by one of D.C.'s most popular tourist attractions.

Pilgrims each carried a brick to the top of Mount Monserrate to help build this historic sanctuary in Colombia.

This Bogotá museum houses the world's largest collection of pre-Columbian gold relics.

Perched atop the highest hill in Cartagena, this 17th-century convent offers spectacular views of the city.

The colonial city's social history is reflected in its fanciful door knockers.

Storied crypts fill the most famous cemetery in Colombia.

An inspired museum dedicated to the patron saint of enslaved people, inside the cloisters where he lived and died.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

A lawn full of retired spacecraft on display at one of NASA's first research labs.

Unexplained bald patches in the landscape grow and recede over time, as though they are somehow alive.

Far from the shore, this sandy victim of the Skeleton Coast looks like it was plopped in the middle of the desert.

A desert that rolls right up to the ocean, where it's so dry animals live off the fog.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

There is only one place in the world where the corners of four nations come together.

This "dead marsh" sits among the largest sand dunes in the world, a forest frozen in time.

Exact replica of the ancient monument, but much, much lighter.

A former major munitions plant that has been converted into a sprawling art space.

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

Yo, Adrian!