This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

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

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

One of two side-by-side totem pole parks dedicated to educating visitors on Tlingit history and culture.

A mysterious and endangered parasitic herb from the California desert.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

A sharp bend in a dramatic river canyon cut through red rocks.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

An underground mansion with fruit-bearing trees and grapes growing beneath the surface of central California.

The only thing stranger than stumbling onto these philosophical musings is the story of the homesteader who created them.

Experience a quartz crystal sound bath inside a storied, all-wood sound-chamber.

A secret climbing tree hides along the side of a Costa Rican road.

The winter home of millions of migrating monarch butterflies.

A replica that won't float away.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

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

The "world's biggest dinosaur" once housed a creationist museum in its abdomen.

Oldest building in California still in use.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

Open day and night, a church with three pews and Bibles.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

The ruins of a town wiped out by the second-largest earthquake in recorded history.