The overgrown remains of an old rail bridge rise above the valley like ancient Greek ruins.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

This abandoned stepwell is one of the largest, deepest, and certainly one of the creepiest in India.

The whimsical steel spider lurking in the shadows of this suspension bridge shows that engineers can have a sense of humor.

A tiny island is connected to the mainland by a private railway that residents travel in their own personal wagons.

A medieval military street hidden beneath a charming French fishing village.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

An 18-mile-long tunnel for sewage waste will soon wind within the bowels of Washington, D.C.

This charming railway is one of the oldest and steepest funiculars in England.

The 20-mile causeway that separates the Netherlands from the sea.

This oddly placed 15th-century church is one of only six bridge chapels left in England.

An Industrial Revolution-era public work that purified water using nothing but sand.

A close look reveals that the Scottish monument is just slightly off-kilter.

This bug-eyed water wheel uses the power of the Sun to clean up Baltimore Harbor.

This hollowed salt dome is the largest oil storage facility in the world, hoarding 250 million barrels of crude oil.

The world’s largest concentrated solar plant generates as many problems as megawatts.

This fortress sits atop a centuries-old well system.

At 238 feet above the bottom of a gorge this span is known as the biggest thrill on the road to McCarthy.

One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

This derelict superstructure was a very important warning system for the Soviet military.

The world’s first dedicated cloud observation platform.

A futuristic climate change study is nestled deep within this public land.

This laboratory has a remarkable concrete roof that measures less than an inch at its thickest point.