can anyone help me?

First: Here's a quick (original & copyright) poem about London's Big Ben:

Big Ben's Gothic tower
Chimes the passing hour
Yet it's now on a lean
Because under there's building been.

Not exactly brilliant, but I wrote it to show how one goes about writing about a historical building or site.

YOU HAVE TO KNOW ABOUT THE SITE!

Take the Big Ben poem. Big Ben is the clock/clock tower built onto the House of Westminister (ie UK parliament) in London. Big Ben has a clock and the clock is at the top of the tower.

But the lean? I read an article recently that explained Big Ben (the tower) was leaning badly DUE TO UNDERGROUND WORKS. Over the last 20-30 years, the land underneath was dug up to build a carpark and other constructions. But this weakened the foundation of the tower, causing it to lean. The article estimated that the tower would fall over in a hundred years if current leaning continued and nothing was done.

THAT'S an interesting thought - and it goes to bigger principles as well. If the foundations of something are weak, the whole structure (whatever it may be) is in real danger. This is the sort of concern poetry has always had; poetry is about taking the 'specific' (ie Big Ben) and using it to draw parallels with larger problems/concerns in the universe. What can your favourite historic site say about that sort of thing?

When you have found out as much as you possibly can, then (often) a poem falls into place. A poem (often) writes itself when you have SOMETHING TO WRITE ABOUT. But if all you know about a historical site/place comes from three lines in a tourist brochure, of course there's 'nothing to write about'.