ADVENTURE AQUARIUM— Nearly 200,000 square feet of sea life and wildlife can be observed in this fantastic facility just across the Delaware River on the Camden waterfront. See hippos in the West African River Experience, catch penguins swimming on Penguin Island, and gaze at sharks in a 40-foot walkthrough tunnel. Neighbors Camden Children’s Garden. Tickets: $21-28, free ages under 2. Open daily 10 am-5 pm. www.adventureaquarium.com. 1 Riverside Dr., Camden, N.J., 856.365.3300. Map 1, 4K
CITY HALL AND TOWER— City Hall is the world’s tallest masonry structure and the country’s largest municipal building. Tours depart City Hall Visitor Center M-F at 12:30 pm ($8-12); or, take in views from the top of the tower M-F 9:30 am- 4:15 pm ($4- 6). Closed weekends and all city holidays. www. phlvisitorcenter.com. Broad and Market streets, 215.686.2840. Map 1, H5
EASTERN STATE PENITENTIARY HISTORIC SITE— Once the most famous and expensive prison in the world, Eastern State Penitentiary is now a haunting, crumbling, abandoned place remembered for its notorious captives. Tours include cellblocks, solitary punishment cells, Al Capone’s cell and death row. Tickets: $10-14. Open daily 10 am-5 pm (last entry 4 pm). www.easternstate.org. 2027 Fairmount Ave., 215.236.3300. Map 1, F2
FAIRMOUNT PARK HOUSES— These 18th- and 19th-century mansions, which feature period furnishings, are considered to be some of the finest examples of early American homes. Call each house first for seasonal hours. $5-8, $5 seniors ages 65 and over, free children ages 6-12. Tours of mansions are offered by the Park House Guides. parkcharms.com.
FREE LIBRARY OF PHILADELPHIA: CENTRAL LIBRARY— Unique holdings run the gamut from 4,000-year-old clay tablets to a collection of orchestral music that numbers more than 13,000 compositions and, of course, lots of books. Author events are frequent, as notable writers often make this a stop on national book tours. Open M-Th 9 am-9 pm, F 9 am- 6 pm, Sa 9 am-5 pm, Su 1-5 pm. www.freelibrary.org. 1901 Vine St., 215.686.5322. Map 1, G3
LAUREL HILL CEMETERY— Founded by librarian and Quaker John Jay Smith in late 1836, this burial ground was intended as a rural location away from Center City and avoided any religious affiliation. Just off Kelly Drive, these scenic grounds are the final resting place of numerous figures in Philadelphia history, including astronomer and inventor David Rittenhouse. Open M-F 8 am- 4:30 pm, Sa-Su 9:30 am- 4:30 pm. www.thelaurelhillcemetery.org. 3822 Ridge Ave., 215.228.8200. Map 1, D2
PHILADELPHIA ZOO— America’s first zoo is a Victorian-landscaped, 42-acre area housing more than 1,300 animals in naturalistic habitats. Be sure to hop aboard the Channel 6 Zooballoon and embark on a soaring safari 400 feet above Philadelphia. This month: Easter Bunny Brunch, April 15-16. Tickets: $18-20, free for ages under 2. Open daily 9:30 am-5 pm. www.philadelphiazoo.org. 3400 W. Girard Ave., 215.243.1100. Map 1, C2