1. Houston: Downtown Underground Tunnel Tour
Discover why Houston, the most populated city in Texas and the 4th most-populated city in the United States can look like a ghost town during warm summer days. This is because just 20-25 feet below street level, there are more than 7.5 miles of underground tunnels that encompass Texas' tallest skyscrapers and serve as a corporate playground for a multitude of Fortune 500 companies. Start the tour at the famous Hyatt Regency Hotel in Downtown Houston and set off on a unique tour to some of the city's most well-renowned skyscrapers. Enjoy great photo opportunities alongside Texas' two tallest buildings, the oldest bank in Houston, and the newest portion of the downtown tunnel system. During the tour, learn all about the history of the city's extensive Tunnel System and its modern corporate appeal including a diverse range of great dining options and business amenities that resemble Houston's diversity.