Budapest is renowned for its thermal baths, and a visit to these baths is a must for anyone traveling to the city. Here are some of the best thermal baths in Budapest:

1. Széchenyi Thermal Bath: Széchenyi is one of the largest and most famous thermal baths in Europe. Its Neo-Baroque architecture and 18 pools, including indoor and outdoor thermal pools, make it a favorite among locals and tourists. It's also known for its iconic chess-playing locals in the outdoor pool.
2. Gellért Thermal Bath: Located in the Gellért Hotel, this Art Nouveau-style bathhouse is not only famous for its thermal pools but also its stunning architecture. The indoor pool area is particularly impressive with its mosaic-covered walls and glass roof. The outdoor wave pool is another highlight.
3. Rudas Baths: Rudas Baths date back to the Ottoman era and have a unique, historic atmosphere. The octagonal main pool has a dome with colorful glass windows, creating a magical ambiance. On certain nights, Rudas hosts coed "Sparty" (spa party) events.
4. Király Baths: Another Ottoman-era bath, Király Baths, are known for their Turkish-style architecture and octagonal pool. It's a smaller and quieter bathhouse, making it a great option for those seeking a more intimate experience.
5. Dandár Baths: These lesser-known thermal baths offer a relaxed and local experience. The complex includes thermal pools, saunas, and steam rooms. It's a great place to unwind away from the crowds.
6. Rác Baths: Recently renovated, Rác Baths blend traditional Turkish and modern design elements. It's a smaller bathhouse but offers a serene and historic atmosphere.
7. Lukács Baths: Lukács Baths are known for their medicinal water and have been frequented by famous artists and writers over the years. The complex includes several pools, saunas, and a drinking hall where you can sample the thermal water.
8. Palatinus Strand Bath: Located on Margaret Island, Palatinus Strand Bath is a family-friendly complex with numerous outdoor pools, water slides, and children's play areas. It's a great choice for a fun day in the sun during the summer months.
9. Veli Bej Baths: Another Ottoman-era gem, Veli Bej Baths, offers a more tranquil experience with its beautiful domed pool and traditional Turkish architecture.
10. Lukács Thermal Bath and Swimming Pool: Lukács is another popular option for those seeking the therapeutic benefits of Budapest's thermal waters. It's known for its healing properties and medical treatments.

Before visiting any of these thermal baths, it's a good idea to check their websites for current opening hours, admission prices, and any special services or events they may offer. Each bath has its unique charm, so you may want to try more than one during your stay in Budapest to experience the diversity of the city's thermal bath culture.