This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

This device was crucial to the Industrial Revolution development of Leeds.

The world's shortest funicular ferries beachgoers a whopping 128 feet from clifftop to shore.

Scotland's only funicular railway is also the United Kingdom's highest.

Once known as one of the finest tourist railways in Europe.

The world's tallest bridge is also possibly the most elegant.

This work of engineering is imbued with elegance and ingeniousness.

A steam trawler with a whiskey-soaked history driven ashore in 1960 resides rusty but still standing on the shoreline.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

The social hall of this former factory is a Communist-era time capsule.

Once the largest rope factory in Greece, this abandoned plant now stands like a ghost of industry past.

The railway carts travelers to central Athens's highest peak, which offers stunning vistas of the city.

The abandoned military base looks like a post-apocalyptic wasteland.

A decomissioned facility where the German "Transrapid" maglev trains were once tested.

Oberweissbacher Bergbahn - a broad-gauged cable car capable transfering railcars.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

A historic steam train meanders along one of the most scenic rail routes in Germany's Black Forest.

A subterranean display of public art and architecture.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

A tiny, intricate model railway system.

This old wooden funicular railway leads to a cemetery in the forest.

A rare water-powered funicular, it uses a huge tank of water and gravity to do its work.

Abandoned since 1998, this train station has become an oasis for urban explorers.