This Is the Most Claustrophobic Hike in Maryland—Would You Try It?

A riverside stroll with a cave and a tunnel might not sound intimidating, but this little loop in Patapsco Valley State Park has a few surprises tucked in. The Old Main Line, Daniel’s Single Track, and Backside of Daniels route easily lives up to the nickname “claustrophobic hike in Maryland,” thanks to narrow paths, tight walls of rock, and one or two darker, more confined sections. It’s short, scenic, and accessible—but if closed-in spaces make you nervous, as they do me, this trail will definitely nudge you slightly out of your comfort zone.

You’ll find the loop in the Daniels area of Patapsco Valley State Park, a long, wooded corridor that follows the Patapsco River for more than 30 miles between suburbs and former mill towns. This section blends natural beauty with history: old railroad alignments, scattered building remnants, and stonework from the park’s industrial past. The river keeps you company for much of the route, but the trail constantly shifts between open riverside walking and sections where the hillside and man‑made structures press in close.

On paper, the stats are friendly—around 3 miles, roughly 300 feet of elevation gain, and usually rated “moderate.” The Old Main Line portion uses a former railroad bed, so it’s mostly flat, fairly wide, and easy to follow. It’s a good place to settle in, enjoy the sound of the water, and peek down short side trails to small beaches and bouldery riverbanks. Then the character changes. When you join Daniel’s Single Track and the Backside of Daniels, the route climbs away from the river on much narrower tread. Here, the slope rises on one side and gently drops on the other, giving hikers a closer view of the hillside and surrounding landscape.

The claustrophobic moments start early. Not far from the parking area, a short spur leads to Camel’s Den Cave, a shallow rock shelter carved into the hillside. You don’t go deep underground, but stepping under the overhang still means ducking into a cool, dim pocket of stone where the outside world vanishes behind you.

Later, the route passes a low stone tunnel built beneath the rail bed. Walking through it, you’re hemmed in by thick masonry walls and a curved ceiling, with water and rocks underfoot and a bright circle of daylight glowing at the far end.

Between those two features and the occasional overgrown stretch of singletrack where tall grass brushes your legs and branches crowd the path, the trail delivers a steady drip of subtle “squeeze” moments rather than one big scare.

A few practical tips before you go: parking at Daniels is small, so arrive early on weekends, and there are no restrooms at the trailhead. The loop is shared with mountain bikers and sometimes horseback riders, especially on the singletrack, so stay alert and step aside when needed. Muddy patches and slick leaves can make short climbs trickier after rain, and late-summer vegetation means long pants and a tick check are wise. Many hikers tackle the loop clockwise, starting with the steeper wooded sections and finishing along the open river.

If you’re curious how much “squeeze” you can handle without committing to a true cave crawl, this short, scenic loop is a great way to find out and a very strong contender for the most memorable claustrophobic hike in Maryland. Before you lace up, pull up the route on AllTrails for detailed maps, recent trail reports, and tips from other hikers so you can decide exactly how brave you’re feeling on your next visit.

Feeling inspired? Try planning your own Maryland hiking adventure using Only In Your State’s itinerary planner.