Commemorating the spot where the famous scientist fed his pigeons.

Elevated freight railway turned wildly successful urban park.

In Washington's Yakima Valley lies a town "where dinosaurs roam."

Perhaps the world's only gas station inspired by a political scandal.

An outsider art duo's yard has been turned into a whimsical public gallery.

Its 27 graveyards represent the many nationalities and ethnic groups that voyaged to this wilderness in the late 19th century.

The site of the Wellington avalanche, one of the America's worst railroad disasters.

This frequently-photographed waterfall takes only a short hike to visit.

Spectacular volcanic cliffs along the Crooked River invite hiking, rock climbing, and photography.

Rushing water plunges over a 100-foot drop created by an ancient lava flow at this majestic waterfall.

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

An attractive free-plunge waterfall outside Bend in the Deschutes National Forest.

Home to the only outdoor municipal elevator in the United States.

The second largest waterfall by volume in the U.S., Willamette Falls is outdone only by Niagara in the amount of water that is pushed northward.

This massive airship factory is so large that it has its own indoor weather.

Prison made famous by The Shawshank Redemption has been out of commission since 1990.

This harrowing climb along West Virginia's jagged spires is one of the only Via Ferrata on America's east coast.

In 1869, Swiss and German immigrants settled in this small town in the mountains of West Virginia.

This Old Testament garden features 100 plants from biblical times.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.

The ancient latrines of the Greeks, in all their public glory.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

This famous city eluded concrete detection until the early 2000's.