There's a fee to enter the grounds with your car. Visitor Center is big, has a small museum with a recurring film about the Lewis and Clark journey. Gift shop is big and well stocked. Rangers and staff all friendly. Bathrooms were clean and well maintained. The whole visitor center is actually quite nice.
Pompeys Pillar itself isn't the largest or most impressive rock (but beats the heck out of Plymouth Rock which is so disappointing). The park service has built an entire walk way of stairs which makes to very easy to walk up to the engraved signatuve of William Clark and even to the top of the rock. You get a great view of the surrounding area from the top. If you have trouble walking steps, then it may be a bit toomuch for you, but it makes the trip so much easier. It's not wheel chair accessible (nor could it be as its a rock and not a building). Don't be one of the clueless people that tries to bring a stroller only to realize you should have carried you baby or not subjected them in the first place to attempting to climb a rock (even though it has steps).
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