The entrance to this sinisterly named tunnel hides behind a Tim Hortons.

This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.

The playful side of the Columbus community is on full display.

A bronze of the man in all his sinewy glory celebrates his longtime connection to the Ohio city.

According to the legend, this strikingly beautiful hill has miraculous healing powers.

The preserved remains of the former Milwaukee County Hospital for the Insane are hidden in the wooded grounds of County Park.

A historic observatory precariously perched at the "Top of Europe."

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.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

A frozen oasis lies beneath the scorching New Mexico desert.

The world-record holder for the longest bridge stretching continuously over water.

A remnant of the last Ice Age, this lake is surrounded by fascinating rock formations.

This massive redwood tree has a hole in the base big enough to drive through.

The highest point in Oklahoma used to be a lawless outlaw's paradise.

Sitting in the arguable birthplace of the Wild West, this museum holds the largest collection of bronco busting bric-a-brac in the world.

The surprising home of the iconic Santa Monica Pier Ferris Wheel.

Behind the Cowboy Hall of Fame is a burial ground for good horses and a famed rodeo bull.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

This quiet island in the middle of a bustling city is actually a volcano dotted with Māori ruins.

New Zealand's west coast is one of the best places in the world to view these large seabirds.

Known for the tunnel that leads visitors to the water.

This preserved village shows the modest lifestyles of the area's 19th-century Chinese gold miners.

The premier place to experience the Victorian imagining of the steam-powered future.