The Franklin Institute

The Franklin Institute is one of the oldest science centers in the United States and the city's best museum for families, built on Logan Circle along the Benjamin Franklin Parkway. Named for Philadelphia's resident genius, it opens with him: the Benjamin Franklin National Memorial, a domed rotunda where a twenty-foot marble Franklin sits enthroned, is the museum's front room and the most dignified welcome any science museum can claim. Beyond it is the museum's real personality — exhibits that are physical rather than screen-bound. The Giant Heart, a walk-through model of a human heart, has been thumping since the 1950s and remains the building's most beloved walk-through; the railroad hall puts a full-size Baldwin steam locomotive indoors, and visitors can stand in its cab; the Fels Planetarium runs shows under one of the country's historic domes; and permanent galleries take on electricity (Franklin's kite never far away), the brain, flight, sports science and space, with hands-on stations designed for kids to push, pull and test. The museum is open daily, generally 9:30am to 5pm, and ticketed — a general admission ticket covers the permanent galleries, with the planetarium, the large-format theater and big traveling exhibitions often as add-ons. On weekdays during the school year, field trips crowd the mornings; afternoons and early weekend openings are calmer. For families on a Philadelphia trip, it is the easy rainy-day answer and often the kids' favorite stop.

Franklin is the throughline. The institute was founded in the 1820s in his name to promote the mechanic arts and science, and its collection includes artifacts linked to him; the rotunda memorial is a national memorial in its own right, and visitors who come only for it can see the statue at the entrance. Upstairs and down, the galleries rotate between older, beloved exhibits and newer interactive ones, and the mix is part of the appeal: grandparents who walked through the Giant Heart as children walk through it again with their grandchildren, then everyone splits up between the electricity hall and the sports zone.

Planning a visit: three hours is the practical minimum with kids, and a full day is easy. Buy entry ahead, then decide on add-ons once you see the day's planetarium and theater schedule — the planetarium is the strongest of them. Traveling exhibitions are the variable that can turn a visit into a destination, so check what is on. Lunch is available inside, and the Parkway's lawns and Logan Square's fountain are steps away for a breather. Tiqets sells general admission and several combination tickets, including one with the Museum of the American Revolution, which is a sensible pairing for a two-museum trip.

Fit: families first, curious adults second. The institute sits at the Logan Circle end of the Parkway, with the Academy of Natural Sciences across the circle for dinosaur-minded kids, the Barnes a short walk west and the Philadelphia Museum of Art at the end of the boulevard. If the weather turns, if the kids have hit their limit of founding documents, or if you simply want to see a child walk out of a giant heart grinning, this is the stop.