On a recent breezy afternoon, Justin Rivas and his crew lugged a 100-pound, 32-foot ladder across a one-story home as they lined its gutters and peaks with red and white lights. The ladder was almost ...

For a medium-sized thrill at Colorado’s Mesa Verde National Park, you climb the four short ladders that take you into Cliff Palace, a cliff dwelling with 150 rooms. But for a big thrill, you head for ...