This giant steer-skull edifice refuses to die.

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

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

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

A mysterious "wedding cake" castle in the middle of the urban desert.

A mysterious spirit totem at the edge of Navajo lands.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

One of the world's largest telescopes, stares into the night sky with two huge mirrors.

Walk through the actual strap iron cells and solitary chambers of Arizona Territory’s first prison.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

Don't blink or you'll miss it.

This Route 66 classic sports a giant fiberglass rabbit that you can ride.

This golf ball–shaped former desert real estate office now houses a UFO museum.

Open since 1938, this diner has kept its fountain, malt machine, and all the gum that greasers left beneath its counter.

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

Collection of vintage trailers double as hotel rooms.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The world's largest rose bush has literally outgrown the pioneer museum it was planted behind.

A motel dedicated to Southwestern nostalgia.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.