What’s on top of this old Roman building?

What's on top of this old Roman building? Three seconds in, you'll see why I'd stay at the W Rome again. I stayed 3 nights here before my Celebrity Ascent cruise. Full honest review: room, breakfast, location and whether it's worth the money: I Stayed at W Rome — Is It Worth It? https://youtu.be/AvuNU0O2TUo #WRome #Rome #RomeHotels #LuxuryTravel #Hotels

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