Remains of an abandoned coral city.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

A huge musical instrument played by the ocean.

Along a California highway is a kind of Jurassic Park made of metal.

A second generation sun-powered marvel lights up the night.

A luxurious doomsday bunker hidden beneath an unassuming Las Vegas home offers the best of subterranean suburbia.

Inside this park, an engineering marvel from the early 20th-century still stands.

This magical space partly designed by Antoni Gaudi is one of the best examples of romantic gardening in the Mediterranean.

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

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

A preserved oasis with traditional Andalusian-style architecture and beautiful views of the Nile.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

A place of great reverence for Trekkies everywhere, a hero's future birthplace.

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

This central Florida farm is the largest producer of these little golden fruits in the United States.

Where the Millerites gathered to watch the end of the world in 1844—and left disappointed.

This house certainly has a unique decor.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Northern Kentucky’s very own Notre Dame showcases intricate stained glass and the bones of saints.

The grounds and buildings of an old wood pulp mill have been transformed into an innovative art park and museum.

The easternmost town in Alaska can only be accessed from Canada.

This abandoned hospital is one of the most haunted places in Costa Rica.

Space-age monument to an early 20th-century uprising.