Monument

Monument = (1) a structure erected to commemorate a person or event: ‘He erected a monument in the honor of his mother.’ (2) an important site that is marked and preserved as public property because of its historical significance: ‘If you are interested in ancient monuments you will find the Pyramids fascinating.’

See the sights = visit the interesting places in a city or country: ‘I wanted to look around Moscow and see the sights.’