Where Am I?

CLUES

1. This UNESCO World Heritage Site is one of the Seven Wonders of Portuguese Origin in the World.
2. Its port was a stopping place for explorers Vasco da Gama in 1497, on his way to India, and Christopher Columbus in 1498, on his third voyage to the Americas.
3. Its position at the crossroads of civilizations gave rise to the first fully fledged mixed-race Creole society.
4. Once a key port in the slave trade, it has preserved a “pillory monument” that commemorates this sad history.