Bridges are so fascinating, especially when they're historic! We've found three unique bridges in Maryland that are totally worth crossing when you come to them.

Bollman Truss Semi-Suspension Bridge

[gallery columns="2" size="medium" ids="2072,2075"] 8600 Foundry St., Savage, MD Built in 1852 in another location, this double-span truss bridge was moved to its present spot, spanning the Little Patuxent River, in the late 1800s so that the B&O Railroad could reach the Savage Mill. It is called the "World's Only Surviving Wrought Iron Bridge." Nowadays, the 160-foot-long bridge sees only foot traffic, as part of the Savage Mill Trail.

Oldtown Low Water Toll Bridge

bridges Green Springs Rd. SE, Oldtown, MD

Back in 1937, a man named Mr. Carpenter obtained the needed permits to build a simple wooden bridge across the Potomac River, thus saving motorists an hour in drive time when traveling to Cumberland. Built with just 12 or so concrete pedestals, the bridge straddles the state line between Maryland and West Virginia and is one of the only remaining private toll bridges in the country. As long as the water isn't too high, you can pay a small fee and cross the state line on creaky wooden planks!

Read more about this historic bridge on its website.

Burnside's Bridge

[gallery size="large" ids="2073,2076,2071"] 5831 Dunker Church Road, Sharpsburg, MD Built in 1836, Burnside's Bridge was originally constructed so farmers could cross Antietam Creek and transport their livestock or crops to Sharpsburg. But now the bridge, which is 12 feet wide and 125 feet long, is brimming with Civil War history, as it played a key role in the Battle of Antietam, in September of 1862. Situated in a very scenic area, the bridge is open to foot traffic and is one of the most photographed Civil War bridges. Have you been to one of these historic Maryland bridges? Do you know of others we should visit? Tell us in the comments!

Here are three great places to take your kids this summer!