A tiny red pebble marks what may be the quietest outdoor spot in the United States.

This early Norman castle was the first historical monument protected by an act of Parliament.

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

More than 700 species live within this murky marvel of a swamp on California's coast.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

These upturned herring boats make nifty storage sheds for fishing goods.

Ireland's most remarkable collection of these curious cone-shaped houses is worth the buzz.

A trio of giant megalithic stones in the middle of a golf course.

The last manually operated turntable ferry in the world.

Thousands of birds nest in the cliffs while arctic foxes prowl below.

Upside-down trees serve as natural flower pots in this hanging garden of Alaska.

These free-roaming horses were once destined to disappear from the land.

These imposing walls and towers look more like the ruins of a fortress than a monastery.

The world's northernmost brewery uses water from a 2,000-year-old glacier to create its beer.

A charming Spanish village sits atop this natural limestone overpass.

Colorado's only true geyser is hidden within the San Juan National Forest.

A hidden tunnel leads to a medieval queen's shrine buried beneath a parking lot.

A deserted Bedouin village lines the shores of this stunning desert oasis.

Every birth, death, and marriage is recorded in these color-coded leather-bound books.

Images of neighbors past and present guard the streets of this charming alpine village.

This 19th-century ranch is being transformed into a residential library with thousands of books about the natural world.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."

Inside this Icelandic greenhouse, geothermal energy keeps tomatoes warm and growing.

The oldest church in Iceland is one of the few to feature ornate decoration.