The largest of only eight working transporter bridges left in the world.

The longest and tallest aqueduct in Britain can actually be sailed across.

Rusted structures stand like ghosts of Cyprus' 6,000-year-old copper industry.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

This Victorian marvel of engineering and artistic prowess is nicknamed the "Cathedral of Steam."

This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

1920's mining camp and environmental education center is serving to protect the surrounding forest, one of the last of its kind in the Pacific Northwest.

Go deep down into the earth to experience the world of Welsh coal miners.

One of the largest artillery pieces in the world sits in a Washington D.C. parking lot.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Located in the thermoelectric factory that once powered the entire city, this Portuguese museum is shockingly fascinating.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The remnants of an early American attempt at missile defense.

The world's largest military aircraft cemetery.

At least 14 twice-retired ships were sunk to make a lovely rusting breakwater in Comox Harbour.

Surreal riveted sea forts once protected the Kent shores from German attack.

Soaring over the Niagara Whirlpool since 1916.

The largest preserved walking dragline excavator in Western Europe.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

A Very Low Frequency transmitter you can tune in on your PC.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Home of Howard Hughes' Spruce Goose.