Submerged lava formations create incredible waterworks.

A prehistoric landscape hidden in the cliffs of Maha'ulepu.

This blowhole is supposedly caused by a trapped monster.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

This narrow coastline trail through the dense Kauai wilderness is among the most beautiful and dangerous in the world.

A nourishing complex of found object art, paintings, and sculptures that celebrate key figures in Black history.

A wedding chapel, vintage clothing shop, and bar all under one roof.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

Radioactivity still cause for concern at this urban explorer's paradise.

A 140-year-old castle with underground caves hidden in San Francisco.

A raised boardwalk winds through a thicket of stunted, century-old trees no more than nine feet tall.

Celebrating the transformation of trash into objects of beauty.

A trash dump made beautiful by nature's power.

Canyon walls shrouded in ferns.

A grove of "candelabra redwoods" deep in California's Lost Coast.

Folk art crafted from discarded vegetable crates.

An optical illusion found amid a logged redwood forest.

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

The mysterious round rocks of Schooner Gulch.

This whimsical seashell-shaped place of worship was designed to blend into its surroundings.