A moderately difficult trail leading 1.4 miles (one way) past spectacular views of the canyon and eastern plains to the remains of historic Crags hotel, 600 feet above the trailhead. Built in 1908, the hotel was accessed via an inclined railway from the canyon floor until it burned down in 1913. <br />
The trail continues as a .8 mile loop as it travels to a view of the Continental Divide and the railroad tracks, 1,200 feet above the trailhead. The trail is 1.4 miles to the ruins and another .8 mile for the loop, making the total roundtrip distance about 3.6 miles.
It's in Eldorado Canyon State Park. From Boulder, drive south on CO HWY 93 5 miles to CO HWY 170. Take this west for 2.5 miles to the entrance to the park. The trail head is on the south side of the road, a couple of miles into the park. I park at the lot beyond the trail head, which is where this track is from.
http://www.tripleblaze.com/trail.php?c=3&i=947