Texan In London

A Texan is visiting London and his taxi driver is taking him on a tour of the City's historical landmarks.
As they went past the Tower of London the cabbie explained what the building was and provided a brief history. Upon hearing that its construction started in 1346 and was completed in 1412, the Texan stated, "Really? A little ol' tower like that? In Houston we'd have that thing up in two weeks!"
Next they passed the House of Parliament, and the cabbie again gave a brief history, omitting the construction dates this time. However, being eager to brag, the Texan questioned its construction too. The cabbie replied that it was built in 1544 and completed in 1618.
"Well, boy, we put up a bigger one than that in Dallas and it only took a month!"
As they passed Westminister Abbey the cabbie was silent.
"Well? What's that over there?" asked the Texan.
The annoyed cabbie scratches his head and replied "I haven't the foggiest idea, Sir. It wasn't there yesterday!"