Places Marbles07 Wants to Go

This series of rope-style bridges brings visitors into a jungle layer that is usually reserved for birds and monkeys.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

A factory director designed what was the world's longest suspension footbridge in 1923 so his employees could get to work safely.

The latest in a series of long glass bridges suspended at terrifying heights.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

This national park on the shore of Lake Michigan features remarkable dunes that lie at the heart of a Chippewa legend.

America’s smallest national park site is the former residence of exiled Polish national hero Thaddeus Kosciuszko.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

A 19th-century cabin built into a hollowed-out Sequoia tree.

Terraced flowerbeds and rock sculptures in the midst of the Minnesota wilderness.

The ghostly remains of what was once the world's richest copper mine.

The ruins of Theodore Roosevelt's beloved ranch stand in a forgotten corner of a national park named after him.

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

These cinderblock farmhouses were actually World War II radar stations in disguise.

The world's longest known cave system.

The longest living non-clonal organisms on Earth.

The only road through the heart of Glacier National Park.

Windswept and remote, this island was once the home of a rare mammoth and today is home to a rare tree.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

An abandoned mine where dreams of quicksilver trickled away over 75 years ago.

Steep canyon walls hide a forested oasis in the West Texas desert.

This crumbling stump is all that remains of what was once thought to be the oldest living organism.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.