The ancient Peruvian city of Machu Picchu is one of the world's most popular tourist attractions for good reason. Get lost in this famous "city in the clouds" with Matt and Rachel in this video podcast from HowStuffWorks.com.

Uluru, also known as Ayers Rock, is a vibrant red rock formation in the heart of Australia. Find out why it's a great place to visit -- and to catch a sunset -- in this video podcast from HowStuffWorks.com.

The Great Barrier Reef, which is actually made up of thousands of individual reefs, is a wonderland of marine life. Take a swim near this amazing ecosystem -- and meet some of its many inhabitants -- in this video podcast from HowStuffWorks.com.

The transition between one year and the next is a momentous occasion that is celebrated all around the world in a variety of ways. In this episode, Matt and Rachel take a look at some of these New Year's traditions.

Over the centuries, Christmas has acquired a lot of nifty traditions, from special foods to festive foliage. In this episode, Matt and Rachel pay homage to one of the most popular symbols of the season: the Christmas tree.

The Cambodian temple of Angkor Wat is a wonder of the ancient world -- and it's also a great place to climb stairs. Find out why stair climbing and Ankgor Wat rank as the Coolest Stuff on the Planet in this video podcast from HowStuffWorks.com.

Singapore offers visitors a wide array of attractions, from multicultural cuisine to performing arts. Find out why Singapore is a great place for theater -- and good behavior -- in this video podcast from HowStuffWorks.com.

The Ngorongoro Crater in Tanzania offers a safari experience like no other. Find out why this mini Serengeti is a great place to birdwatch in this video podcast from HowStuffWorks.com.

In this episode, Rachel and Kathryn explore the origins of harvest festivals. Highlights include American Thanksgiving, Kwanzaa, Sukkot and more. Tune in to find out what a "Pearly King and Queen" is and what it has to do with harvests.

A trip to the lake can be a lot of fun, especially if that lake is one of the biggest in the world. Find out why Siberia's Lake Baikal is a must-see in this video podcast from HowStuffWorks.com.