This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

The nerve center of a massive, state-of-the art radio telescope that sprawls across Western Europe.

This giant radio telescope would be a rusting ruin if it hadn't become such a beloved relic.

For a moment, you could think there are two identical communication towers in a row, but one of them is made out of PVC.

The struggle of a small Dutch island against the sea.

Lombardy poplars planted to imitate the size and shape of the Cathedral of Notre-Dame de Reims.

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

These 4,444 wooden steps straight up a mountain were built to serve a hydroelectric power station but these days, they're mostly used by hikers.

This giant boulder is pinched over a 1000-meter abyss by two mountains.