Houston: Guided Tunnel Tour + NASA Space Center Entry + Transfers

Start your visit to Houston with a walk through Downtown's tunnel system, the largest in the U.S. See top architecture, including the tallest building in Texas and the oldest bank in Downtown. After the tunnel tour, visit the NASA Johnson Space Center in Clear Lake. Explore exhibits like Independence Plaza and Rocket Park, and take tram tours. Spend about 5 hours at the Space Center before boarding your transfer back to Downtown Houston.