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Turtle Park has the coolest playground in town. The centerpiece is an enormous sandbox littered with eminently climbable turtle sculptures and plastic shovels and buckets. In the summer, you can get the sand off your kids away without a trip to the bathrooms at the "sprayground." The park is fenced in and has plenty of shade, as well as four baseball fields, two basketball courts, two tennis courts, and a rec center.
Friendship "Turtle" Park is located at the junction of 45th and Van Ness Streets in the American University Park neighborhood of Washington, D.C. It is part of District of Columbia Department of Parks and Recreation. Renovation in 2015 was delayed because a sewer was discovered running under the recreation center.
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Fort Reno was one of the bedrocks of the legendary and celebrated D.C. punk/hardcore/straight-edge scene, and evolved to encompass later post-hardcore and other local indie rock. The concert series was founded in 1968 as a sort of government-sponsored hippie fest to try to bring some love, joy, and sense of community back to the district post-1968 riots. Having run annually since, this is one of the truest local traditions, is beloved by the community, and a great way to delve further into that elusive city beyond the federal government and neoclassical memorials. No alcohol, no glass bottles, but plastic bottles are allowed.
Cathedral Church of Saint Peter and Saint Paul
The impression of walking up to the world's 6th-largest cathedral, a hulking mass cut over a period of 83 years of 150,000 tons of stone, is alone worth the trip. Tours are a must if you really want to see the cathedral, and the towers and the crypt are off limits without a guide during the busy season. The organ demonstrations are spectacular and loud. Check the website for events, as there is often children's programming as well as major concerts.
Little known even to locals is this private house-museum with an impressive collection of paintings by the impressionist and early modern masters. The house itself is a work of art, designed by modernist architects Philip Johnson and Richard Foster.
A hidden gem of magnificent proportions. Marjorie Merriweather Post, prominent businesswoman and heiress to the Post Cereal fortune, fashioned her estate next to Rock Creek Park to be an extraordinarily stately and luxurious site for entertaining guests, housing her impressive art collections, and with the intention of leaving it behind for the world to enjoy. The mansion is a treasure trove of French and Russian decorative arts, much of which she obtained from the USSR, whose government under Stalin was then auctioning off a good portion of its cultural heritage to finance its war efforts. Second in grandeur only to the art collection itself are the French and Japanese-style gardens—great places to linger long after the tour.
A historic water-powered mill in the park and a national historic site built by Isaac Peirce in 1829.