4 Best Sights in Northern Portugal, Portugal

Plans for an underground car park in front of the city's courthouse were canceled in 2006 when remains of the long-lost Roman baths, dating back to the 1st century AD, came to light—steam still rising from the hot spring. The therapeutic complex is one of the largest unearthed in Europe, with two large pools and seven smaller ones, and a hydraulic system that still works today. The museum opened in 2021.

This late-17th-century church next door to the Torre de Menagem is lined with huge panels of blue-and-white azulejos depicting scenes from the New Testament.

Chaves-born Nadir Afonso (1920–2013) worked as an architect with the likes of Le Corbusier and Oscar Niemeyer, and also made waves as a painter. Many of his most important works are on display at this sleek museum, designed by his still more famous compatriot, Álvaro Siza Vieira.

The city's most prominent landmark is this great, blunt, 14th-century castle keep overlooking the river. It houses the military collection of the Museu da Região Flaviense (Flaviense Regional Museum), where a hodgepodge of local archeological finds are presented in a free display at the neighboring city hall. The ramparts around the tower offer grand views of the town.