Built for an exposition in 1915, these horticultural displays have stood the test of time.

A treasure trove of rare and exquisitely detailed antiques

The oldest operational cathedral in the U.S. has one shell of a way of projecting speakers' voices.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

A mass grave for victims of an airline disaster that led to much-needed safety improvements for commercial flights.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

See massive fossils that are over 200 million years old in northeastern Arizona.

One of the ghostly stops along Route 66.

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

Everything you always wanted to know about borates is here.

A giant desert bird that once swung music fans at Coachella now has a home in a nearby traffic circle.

The ghostly remains of an accidental sea.

A museum dedicated to a sea that should have never been.

Quite simply the largest tree in the world (by volume).

Four hundred granite steps were built into this massive rock by the National Park Service.

This small shack near the entrance to Sequoia National Park has been in almost continuous operation for the last century.

A water tower shaped like a giant coffee pot looms over a small Swedish village in Central California.

This massive statue of John Muir on the side of a California highway was carved from a redwood tree.

The first North American landing spot for James Cook on his third voyage of discovery in the Pacific.

The only house in Oregon designed by the famous architect, Frank Lloyd Wright.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

A fine, large-aperture telescope available for public use.

Over 75 historically themed murals grace the walls of a small Washington city.

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