The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

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

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A striking, menacing sandstone peak towering above a landscape that's equal parts Mordor and the Moon.

The unusual patterns in this rock formation result from two distinct modes of weathering.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Don't blink or you'll miss it.

A spiritual vortex among the red rocks in Sedona.

An homage to everyone's favorite prehistoric cartoon family.

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.