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The Concord Lighthouse in Havre de Grace, Md where the Susquehanna river empties into the Chesapeake bay is unique in that it is made all of granite, even the stairs.  It has lasted almost 200 years, having been built in 1827.  It is open on weekends to climb for free.  Most lights that you can climb require an admission of a few dollars to help pay for the upkeep.  It is only 36 ft high with only 35 steps. The last 8 steps are an iron ladder and the lenses are still there. The keepers house has been turned into a free museum.  Across the street is a maritime museum covering the crabbing and fishing industry of the past 200 years of Havre de Grace.
Elk Neck State Park is on the end of a peninsula with the Elk river on the east side and the Chesapeake bay on the west.  At the southern tip is the Turkey Point Lighthouse.  The next morning I cycled the 5 miles from the campground to the light over many steep hills.  The last mile is over a gravel road which I luckily took my mountain bike instead of my road bike.  The lighthouse sits on a hundred foot high bluff where the Elk river meets the Chesapeake.  The light was built in 1833 and the coast guard decommissioned the light in 2000, then deeded the land to the state park.  The light comes on daily and is powered by solar powered batteries.  the wood stairs were rebuilt in 2007.  The public can climb the 32 ft high light on weekends.  With binoculars you can see the Concord light.  In the 1800s all light keepers had to haul the whale oil or lard or kerosene up the steps at night, then work in their vegetable gardens, feed the chickens, milk the cow or goat, before going to bed.  In their spare time they fished for food.