1. San Juan de Ulúa Fortress, located in Veracruz, Mexico, has a rich history dating back to the 16th century. It served as a Spanish fortress to protect against pirate attacks, as a military prison, and as a customs house. The fortress is situated on an island and is connected to the mainland by a causeway. The architecture is a mix of Spanish and Mexican styles, with thick walls and cannons still visible today.

2. The working hours of San Juan de Ulúa Fortress can vary, so it is best to check the official website or contact them directly for the most up-to-date information. The phone number for the fortress is +52 229 989 2506.

3. Ticket prices for the fortress also vary depending on the type of visit. There are guided tours available which may have a separate fee. Transportation to the fortress is easily accessible by car, taxi, or public transportation in Veracruz. The island is just a short distance from the city center and can be reached by a short boat ride.