The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

High atop a Mexican rainforest mountain, this ancient pyramid once drew pilgrims countries away.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

These mouldering mansion ruins remember a time when the Catskills were nothing but luxury.

A massive underwater sinkhole made famous by Jacques Cousteau.

The attic of a four-century-old canal house hides a clandestine church.

This historic abandoned train station looks like a stop for ghost trains.

A remarkably intact castle that once was the largest in Ireland.

A man-made island fort that has housed soldiers, scientists, and ravers.

These 18th century gardens tell a rocky story of the son of Odysseus.

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

This abandoned plantation was once witness to an eclipse that proved Einstein's theory of relativity.

First known as the "Sample House," this construction mash-up was meant to be a living catalogue of building styles.

A turquoise lake within a volcanic crater.

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

The lush coastal city of Astoria is riddled with forgotten secret sidewalks.

Cat art as far as the eye can see.

The site of a tragic massacre that spawned a multimedia franchise.

This historic observatory was established to keep shipwrecks from littering the Cape of Good Hope.