Morning people-watching in Denver, including the Red Rocks Amphitheatre and the 16th Street Mall.

A tour of the best beaches on the tropical island of St. Thomas.

A stormy nighttime look at a cityscape on the edge of "Tornado Alley."

Watch one of the world's most famous and accessible waterfalls move 750,000 gallons of water each second.

Bundle up and watch a winter waterfall in Michigan's Upper Peninsula.

An evening visit to the Pacific Coast, under the brilliant fresnel lens of a historic light station.

An afternoon tour of the countless historic sites in one of the greatest cities in world history.