A massive volcanic plug is now a protected area that hosts a number of bird species.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

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

This hot dog-shaped diner has moved all around Colorado, never been to New York.

Travel through the wholesome amusements of yesteryear at this charming miniature village.

Not one, but two of Frank Lloyd Wright's architectural masterpieces nestled on the same street.

A supersonic jet stands on a pedestal in this rural village as a monument to military aviation.

This remote highway took over 50 years to build.

This spa shower is an interactive art piece that reflects the feeling of Scandinavian seasons.

This 13th century Orthodox monastery is built right into the Moldovan cliffside.

One of the world’s longest pedestrian suspension bridges.

One of the oldest standing structures in Montgomery County, Maryland.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

Follow the steps, and this roadside artwork will teach you how to dance.

This abstract sculpture was initially so disliked that it got moved to the outskirts of town a few months after installation.

One of the oldest Black communities in western North Carolina and one of the largest Black Mennonite congregations in the country.

This massive vault of comedic history is no joke.

This small island off the coast of Uruguay hosts the largest colony of sea lions and fur seals in the southern hemisphere.

A former special storage facility for documents during the Cold War.

These ordinary blocks of stone are the last surviving remains of Tokyo's infamous red-light district.

A controversial cenotaph dedicated to a local physician with an unscrupulous past.

The 72-foot giant escaped confinement in a large patch of mulch only to be reburied in the sandy shores of the Potomac River.

This garden memorial marks the site where 12-year-old Tamir Rice was fatally shot by the Cleveland Police Department.