In part two of their series on St. Petersburg, Matt and Rachel admire some more of the Coolest Stuff that Russia's former capital has to offer. In this case, some truly amazing architecture and famous landmarks.

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.

Once the capital of Russia, St. Petersburg is often compared to Venice because of its many canals, rivers and bridges. In this first episode of a two-part series, learn more about the city's lovely layout, early history and famous "white nights."

Located off the coast of Costa Rica, Cocos Island isn't your average Central American getaway. Tune in as Matt and Rachel explore this island's unique ecosystem -- along with its mysterious history.

In this Halloween episode, Kathryn and Rachel explore the history of witches in Salem, from the Witch Trials of the 17th century to the modern Wiccan community. Tune in to learn about everything from Salem's month-long Halloween festivities to its maritime history.

Moscow, the largest city in Russia, is a bustling megacity with a storied past and a burgeoning future. Learn more about Russia's capital city in this episode of The Coolest Stuff on the Planet.

Mount Fuji is the national symbol of Japan and an iconic landmark that's recognized the world over. Take a tour of Japan's beloved mountain -- and learn some surprising trivia along the way -- in this episode of The Coolest Stuff on the Planet.

Albuquerque, New Mexico, is home to many ballooning enthusiasts -- and the world's biggest hot air balloon festival, starting this year on October 5. In their Coolest episode yet, Matt and Rachel take you on a tour of ABQ's enchanting (and colorful) "balloon fiesta."

British Columbia's Knight Inlet boasts breathtaking scenery and amazing wildlife. Explore this extensive fjord and meet its furry (and non-furry) denizens in this episode of The Coolest Stuff on the Planet..

Tikal is a popular archeological site that was once a powerful, thriving city-state in the Mayan empire. Learn more about Guatemala's most famous attraction, and some fun facts about the ancient Mayas, in this episode of The Coolest Stuff on the Planet.