Is it true that the area now called Washington DC comprises seven hills?

The next part is understandable and funny if true but is it true that it used to be called Rome, and that a creek running through it was called the Tiber?

That is all true, sort of. Some people referred to it as Rome. It was never officially called Rome, but government building designs were inspired by Roman architecture. The seven hills are not really mountainous like Rome because DC is more flat. There is a Tiber creek that goes through it though.

Thanks Jo. There's also a place northwest of Sydney called Seven Hills, about 20 miles out. Sydney (or most of it) is in a massive basin called the Cumberland Plain so the seven hills are not huge. The plain is about 2700 sq km or 1000 sq mi.

George Washington and several other founders were Masons. (Incidentally my dad belonged to a Masonic Lodge. A very long lived organization.)

Masons are/aren't Christian, have their own theology/have beliefs compatible with Christianity. Take your pick, it's fun.

Masons drew architectural principles from the Romans and other classical architecture.

DC's original government buildings are basically a massive tribute to Roman architecture. So much went into it, such as the "ley lines" that form the sort of star shape of the central street system.

And secret societies formed the underpinning of the US government.

We're probably the creepiest country on earth.