1. Philadelphia Zoo
2. Pittsburgh Zoo & Aquarium
3. Smithsonian’s National Zoo
4. Maryland Zoo in Baltimore
5. National Aquarium
6. Tisch Children's Zoo
7. Shedd Aquarium
8. Lincoln Park Conservatory
9. Lincoln Park Zoo
10. Garfield Park Conservatory
11. National Mall
12. National Air and Space Museum
13. Newseum
14. United States Botanic Garden
15. National Museum of Natural History
16. Farragut Square
17. National Museum of American History
18. Boston Common
19. Top of the Hub
20. Franklin Park Zoo
21. Franklin Park
22. Meridian Hill Park
23. Washington National Cathedral
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