One of these structures designed by Stanford White at the end of [*] Fifth Avenue commemorates the centennial of George Washington's inauguration.
It's not a hotel or a stadium, but Pyongyang is obviously home to the world's largest one of these structures.  Barcelona's example of this form is unusually clad in red brick and was built to welcome guests to the 1888 Universal Exposition. One of these structures designed by Stanford White at the end of [*] Fifth Avenue commemorates the centennial of George Washington's inauguration. Charles Godefroy famously flew a plane through one of these structures in Paris that rises above France's Tomb of the Unknown Solider in the middle of the Place de l'Ã‰toile. That structure of this type was modeled by one built by Domition dedicated to Titus after the Siege of Jerusalem. For 10 points, name these celebratory structures erected by victorious Romans.
It's not a hotel or a stadium, but Pyongyang is obviously home to the world's largest one of these structures.  
triumphal arch [prompt on partial answers]