Portugal dos Pequenitos is an open-air park on the west bank of the Mondego, a few minutes from the old Santa Clara convent. Built in the 1940s, it consists of a large collection of miniature-scale reproductions of Portugal's most famous monuments — the Jerónimos Monastery, the Tower of Belém, Coimbra's own cathedral — alongside scaled-down buildings representing the former overseas territories of the Portuguese Empire.
The whole thing is slightly odd: oversized children pretending to be giants, while architecture from Angola, Goa, and Macau sits alongside Portuguese monuments in cheerful proximity. The context is complicated (the park was built as imperial propaganda), but as an experience it's genuinely curious. Popular with families, and adults tend to enjoy it more than they expect to.