With a penchant for hot tubs and surprising tolerance for cold weather, the monkeys of Japan are curious creatures. Join Rachel and Matt as they explore the Jigokudani area of Japan -- and explain why it's called “Hell's Valley.”

Victoria Falls is a massive, stunning waterfall that straddles the border between Zambia and Zimbabwe. And, like Niagara Falls, it attracts plenty of daredevils. Find out why in this episode of The Coolest Stuff on the Planet.

Jaisalmer, India, is famous for its golden architecture, impressive fort and desert attractions. Tune in to learn more about the "Golden City" of Rajasthan in this episode of the Coolest Stuff on the Planet.

The Pantanal is a large wetland area located in Brazil, Bolivia and Paraguay that's teeming with plant and animal life. Explore the wild, watery world of the Pantanal with Matt and Rachel in this episode of The Coolest Stuff on the Planet.

The falls at Niagara are popular with sightseers, honeymooners -- and daredevils. Tune in as Rachel and Matt explore what attracts so many adrenaline junkies to Niagara Falls in this episode of The Coolest Stuff on the Planet.

The Kanto Festival in Akita City, Japan, is held August 3-6 and is a harvest festival famous for music, parades, chanting -- and men balancing giant poles of lanterns on various parts of their bodies. Discover why the Kanto Festival is Cool Stuff in this episode.

The Brazilian city of Rio de Janeiro is famous for many things -- gorgeous people and places, Carnaval, soccer, poverty and violence. Join Matt and Rachel as they explore the many facets of Rio in this episode of The Coolest Stuff on the Planet.

The small town of Churchill in the Canadian province of Manitoba has a lot of natural attractions -- especially of the large, white variety. Find out why it's a great place to check out bears and whales in this episode of The Coolest Stuff on the Planet.

If you like mud and you like architecture, this episode of The Coolest Stuff on the Planet is a must-see. Join Matt and Rachel on a virtual tour of the world's biggest mud structure -- the Great Mosque of Djenne in Mali, West Africa.

Agra Fort isn't as well-known as its famous neighbor the Taj Mahal, but this huge palace/fortress complex is just as cool. Take a virtual tour of Agra Fort's intricate architecture and colorful history in this episode of The Coolest Stuff on the Planet.