Young adventurers will especially love this science museum devoted to Portuguese seafaring in the 15th and 16th centuries. Its main exhibit covers the age of navigation from the astrolabe (an ancient instrument used to calculate latitude using the sun and stars in day and night skies) to today's GPS systems. Kids can also operate a solar-powered lighthouse, move sailboats around a pool with an air blower, use sonar and look through a periscope in a submarine.