[Answer] In our 23 must-see sights in Lisbon, we send you to one of the city’s most significant historical attractions, the 16th-century Castle of Sao Jorge. What unique hidden gem does it house?

Step 1 : Introduction to the question "In our 23 must-see sights in Lisbon, we send you to one of the city’s most significant historical attractions, the 16th-century Castle of Sao Jorge. What unique hidden gem does it house? "

...1. a verdant rooftop garden 2. the tomb of legendary explorer Vasco de Gama 3. an escape tunnel to the Tagus River 4. a camera obscura

Step 2 : Answer to the question "In our 23 must-see sights in Lisbon, we send you to one of the city’s most significant historical attractions, the 16th-century Castle of Sao Jorge. What unique hidden gem does it house? "

the correct answer is a camera obscura.,:

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