Orcas on display and in the water.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

An out of this world experience.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

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.

Dramatic river bend surrounds a natural red-rocked pedestal.

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.