One of the symbols of Rome is the Colosseum, the largest amphitheatre ever built in the Roman Empire. What was originally capable of seating:

Empire State Building opened in what year?

Which Country Built a Big Submarine that has 3 Seaplanes it can Launch in 1945. This Submarine was Built for Attack Purposes but this Country Lost.

Toronto's First Post Office (or York Post Office) is the oldest purpose-built post office in Canada.

"Kaaba" the most sacred site in Islam, the first building at the site was built by_________