When the USA donated cement and funds to expand the airport in Laos, the Laotians built a massive monument instead.

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

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

This historic street in Quito is known for its seven stone crosses—and one presidential assassination.

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

One of the most iconic sculptures in Caracas looks like a large orange ball suspended in the air.

One of the most historic cemeteries in Quito is an eclectic mix of architectural styles and famous tombs.

One of the largest single-span stone-arch bridges in the Balkans looks like something straight out of a fairytale.

The fifth-longest natural arch in the world, and the longest outside China.

This iconic pavilion in Barquisimeto has a roof made from 16 “petals” that open and close depending on the weather.

This glacier interpretation center houses the world’s only bar made completely from glacial ice.

Ecuador’s historic seat of government has been quietly looted in recent decades, and no one knows how or by whom.

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

This roadside monument commemorates the huge weapon built by an Ethiopian emperor's hostages.

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

This unique depiction of the Virgin Mary may be the tallest kinetic art sculpture in the world.

This cave system allegedly holds the "metallic library" of a lost ancient civilization.

It took 160 years to complete the most ornate church in Ecuador.

The sophisticated hydraulic system of the Nazca civilization.

This 12-inch-tall wooden sculpture of a winged Virgin Mary has inspired much devotion and countless replicas.

This metal tower in the desert provides views of a handful of Nazca geoglyphs.

Outdoor escalators and art have helped change what was once a notoriously dangerous part of Medellín.

This historic fort overlooks Montevideo and appears on Uruguay’s coat of arms.

The oldest operating steam locomotive in Canada runs along this heritage railway.