Food & Fun Food Truck Schedule Special Event Requests Vendor Instructions Texas Union Underground Location Rates Reservations Alienware Longhorn Esports Lounge Tower Tours UT Tower 360° Virtual Tour Cactus Cafe Hours of operation *See Texas Union Building Hours Exterior entrance to the Union Underground, from Guadalupe and 24th Street. Enter through either door and head downstairs to the first floor (you'll be on the second floor when you enter at street level).