Millions of years of oxidation make a drive down this winding Death Valley road surprisingly colorful.

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

Mysterious standing stone formations looks like a petrified forest.

As one of the world's largest hydroelectric dams this plant took two countries to get built.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

An intricately carved Viking church overlooks a glistening fjord.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

The hallucinogenic center of the ancient world.

An ancient octagonal weather station named for the eight Greek gods of wind.

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

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

An ancient knight and a symbol of the city's freedom.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Famously misunderstood wonder of the ancient world

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

The Netherlands' first car tunnel has an unusually rectangular shape.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

Yup, that's a 330-foot yacht passing over the highway.

This disused VLF radio station is no longer in service but the surrounding town still bears its name.

Rich with fauna and flora, nature-lovers can walk across the sea at this UNESCO World Heritage spot.

This historical Netherlands fortress still bears the marks of its single siege.

A seven-century-old jail tells a not-so-pleasant history of crime and punishment.