Engineering

Thanks to its curved shape, this incredibly durable dam "whispers" to visitors.

The world-record holder for the longest bridge stretching continuously over water.

This Gothic castle-like portal is a testament to the amazing craftsmanship of the navvies who built the railway tunnel.

Once considered a marvel of engineering, there are now doubts about the structural integrity of this 5.4-mile cable-stayed bridge.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The skeletal frame of a decommissioned gas-pumping station offers breathtaking views of greater Berlin.

Kuwait City's uniquely designed water towers look straight out of a retro sci-fi cityscape.

The enormous isokinetic structure hangs within a science center in Estonia.

This ornate church designed by a self-taught architect is an eclectic masterpiece in the heart of Central Mexico.

This technological marvel is one of the world's first 3D-printed bridges.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

The futuristic test model of an iconoclastic visionary who wanted to redesign the world.

The oldest of the three remaining bridges in England with buildings on top of them.

An engineering marvel at the time of its construction, this cross-border waterway sought to connect the Black Sea to the Baltic.

What was once the longest suspension bridge in Latin America was directly inspired by the iconic Brooklyn Bridge.

An engineering wonder at Pillnitz Castle protects a precious 230-year-old flowering shrub.

This gaping hole in the middle of a remote mountain lake looks like a portal to another dimension.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.