Find a place where you can make an enormous echo

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Sidequest: Find a place where you can make an enormous echo.

Research publicly accessible places with documented acoustic effects, including access rules; suggest quiet alternatives where noise would disturb people.

What I can provide: Area, travel radius, accessibility needs.
Please deliver: An acoustic outing with etiquette notes.

Ask only for missing information that materially changes the result. Otherwise, state reasonable assumptions and keep the scope manageable. Use reliable sources and link them. Verify time-sensitive details such as hours, prices, access rules, and availability when relevant. If you cannot verify a detail, label it clearly and give me a way to check it. If a required tool or source is unavailable, ask me for the relevant material or explain the limitation. Return a draft or plan for review; do not send messages, make bookings or purchases, or change my files or accounts unless I separately ask.

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