A tunnel with windows, so you don't miss out on the impressive views.

The fifth-longest natural arch in the world, and the longest outside China.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

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.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

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

The only surviving prototype of Buckminster Fuller's revolutionary car.

One of the largest aviation events in the world brings half a million aircraft enthusiasts to Wisconsin each year.

This recently rediscovered Civil War-era submarine was the first to ever sink an enemy ship.

Former villa and estate of James Deering developed to preserve native tropical forests.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

A unique collection of diving equipment spanning antiquity to the present day.

The museum chronicling a treasure hunter's dream, fulfilled.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

Holding multiple historical boats and an entire 19th century village, this New England attraction is the largest maritime museum in the world.

This abandoned horse racing track was an exercise in hubris from its inception.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.