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Aside from special exhibit, including coat check, this is completely free. Just wak right in
Underground system of tunnels that lead easily to all four buildings
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Enough exhibits that don't completely dominate your day. We spent about two hours here, simply browsing and moving without reading too many of the information plaques
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Plenty of seating to rest sore feet
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No WiFi, I've been spoiled by American museums incorporation of wifi and app technology into their exhibits