Engineering

The largest brick bridge in the world.

An impressive century-old, to-scale topographical map of Guatemala.

The world's first and only three-segment bascule bridge folds up into the shape of a capital "N" to let boat traffic through.

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

A frozen relic of Seattle's hydroelectric boom is now a teaching facility for future engineers.

The contents of this safe survived a 37-kiloton nuclear bomb.

The world's first military tank was designed in this English city amid the stalemate of WWI trench warfare.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

This 19th century train workshop is a treasure trove of railroad history.

A half-mile long and three stories high, this bridge over the Des Moines River Valley mimics a descent into a mine shaft.

This little-known hero has been protecting "The Fens" for close to 400 years, and now from its most powerful challenger yet: climate change.

Monuments and plaques commemorate the local man whose invention shrunk the world.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

This nine-story building is the oldest standing skyscraper in D.C.