Today, you can still see Victorian, Georgian and still earlier buildings. Around the river, the streets still have a medieval street pattern and have a bunch of 17th and 18th century houses and inns. Some can be found in Bondgate, Kirkgate and Manor Square.
Thomas Chippendale, the celebrated 18th century cabinet maker and designer, is one of Otley's best known natives. I believe I've heard of his work.
Some of his work can be found at Temple Newsam House in Leeds and Nostell Priory near Wakefield.
If you're a fan of Emmerdale, you'll recognize Otley as Hotton - the market town featured in the television show.