A great option for those traveling with kids, the Henry Vilas Zoo is home to more than 650 animals, including camels, tigers, flamingos and penguins. What's more, it's one of 10 remaining free zoos in North America. The zoo's free admission was a stipulation that Col. William and Anna Vilas made when they gave the land to the Madison Park and Pleasure Drive Association in 1904 "for the uses and purposes of a public park and pleasure ground." The zoo borrows its name from the Vilas' son, Henry, who died when he was young as a result of complications from diabetes. 
 
Travelers can enjoy the various zoo exhibits, including a rainforest aviary, a big cats enclosure, a herpetarium (where cold-blooded animals like reptiles reside) and the Arctic Passage, home to grizzly bears, polar bears and harbor seals. There's also a children's zoo with a herd of goats, a zoo train and a carousel (both the train and the zoo cost $2 per passenger to ride).
 
According to past visitors, the zoo is small but still offers a fun outing for kids of all ages. Plus, the free admission makes it a no-brainer for families. Even better, the zoo is surrounded by Vilas Park, which features two playgrounds and plenty of open space for playing and picnics, among other activities.  
 
The zoo is open daily from 9:30 a.m. to 4:30 p.m. Zoo admission and parking are free. You'll find the zoo less than a mile south of Camp Randall Stadium just south of the university campus downtown. On-site amenities include an indoor restaurant, a seasonal ice cream and coffee kiosk, and a gift shop. To start planning your visit, check out the official website.