Once a bustling fishing village and trading post, today these Cape Verde ruins provide a home only for seabirds and turtles.

This deceptively salty lake looks like blushing pink lemonade.

An abandoned guano-mining city in the South Pacific.

A brick arch is all that remains of this Dutch fort, once a focal point for colonial power struggles in Guyana.

The remains of the last Gonzaga villa, a luxurious palace built in spite of an economic crisis.

The graffitied ruins stand hidden within the Pennsylvania woods.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

A modern ghost town whose inhabitants were driven away by the growth of nuclear power.

This eerily well-preserved coal town was saved from destruction by a Sean Connery movie.

An abandoned stretch of highway, deteriorating next to the operational one.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A toxic ghost town sitting atop a massive coal fire.

An 11th-century fortress home to one of the most influential royal houses in medieval Europe.

Traversing steep Alpine slopes, this engineering marvel is one of the longest and highest funiculars in the world.

The steepest classic funicular in the world glides along a dizzying incline.

Large Hadron Collider and the Birthplace of World Wide Web.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

This fortress dates back to the 6th century and is also the site of a controversial abandoned restoration project.

According to a local legend, this old castle could only be built after a woman was immured in the walls.

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

Nestled at the southern end of the Bay of Vlore in Albania resides ruins that contain Illyrian, Greek, and Roman influences.