A controversial blue hoop has been puzzling freeway drivers since 2013.

Few other hotels can rival the grandeur of the Castle in the Rockies.

The ruins of the "place of the cloud snake" sit in the middle of an urban environment.

Inside a busy metro station, an impressive mural depicts the prehispanic city of Tenochtitlán.

This ancient structure was built by a mysterious civilization that was largely destroyed by a volcanic eruption.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

This conservatory allows a little bit of the tropics to thrive in the middle of a major Canadian city.

This massive mall has hundreds of shops, an amusement park, and a history of deadly amusement attractions.

A museum dedicated to the history and exploration of both popular music and science fiction.

Along this wire fence, travelers have been leaving a particular memento since 2012.

Would you spend the night in Japan's deepest train station?

A museum dedicated to the history of Tokyo's often-overlooked working-class district.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

More than 25 fully functional scale replicas of famous lighthouses dot the shores of Lake Havasu.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A beautiful geyser under environmental threat.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

This foreboding building was the headquarters of the terrifying Spanish Inquisition in Mexico.

The ruins of an ancient temple to the Aztec wind god discovered in the middle of a metro station.

Mexico City's largest market contains a Willy Wonka-esque wonderland.