PORTO, Portugal — Porto takes pride in its beaches, old churches covered in blue-and-white tiles and its famous port wine named after the city in northern Portugal.

Clérigos Church, an 18th-century baroque building topped by the nearly 250-foot Torre dos Clérigos (or Clérigos Tower), offers unrivalled views of the Douro River and Porto's old town.

The fortress-like church is the largest in the city and one of Porto's oldest monuments; it's flanked by twin towers. It has a rather plain stone facade, but inside the Sé you'll find a beautiful ...