The highest bridge in America was built for an almost unnervingly small amount of money.

European castle ruins in an American state park are actually the product of death and grief.

See massive fossils that are over 200 million years old in northeastern Arizona.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

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

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A beautiful geyser under environmental threat.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

This unreal Portuguese palace looks as though it's made from a pile of different castles.

This bridge was constructed from the rubble of the infamous Bastille.

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

This glass skywalk offers vertiginous views down the volcanic cliffs to the beach below.

Built on the remains of one the Incas’ most important gathering spots, this square keeps the spirit of a fallen empire alive.

A backdoor to Machu Picchu that only the most foolhardy infiltrator would attempt to breach.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.