Cruising Federal has been a favorite pastime for generations of Denver residents, and Grandpa's Burger Haven is a key part of this Sunday routine. The old-fashioned burger joint is the perfect location for car-club meetups: It has ample parking, a walk-up service window that won't take you far from your prized vehicle, and a coveted location right on the strip, a prime spot for watching beautiful roadsters roll by. But you'll also be able to see plenty up close at Grandpa's, where tricked-out trucks, lowriders and customized vehicles of both the vintage and cutting-edge variety show off on the eatery's expansive stretch of asphalt.