What Are the Best Textbooks for Challenging Physics Problems?

[Hioj]

Hello everyone

I've recently begun studying "Introduction to Classical Mechanics" by David Morin, and the problems are AMAZING. Do you know of any other textbooks/collections of problems where problems like these can be found? (With solutions) This applies to any undergraduate physics subject, but especially mechanics, electricity and magnetism, thermodynamics, optics, relativity.

 

[WannabeNewton]

Problem book in Relativity and Gravitation by Alan P. Lightman (what an ironic name If I do say so myself) has a lot of rigorous problems involving Special Relativity, General Relativity, and some EM in 4 - space. Check it out if you want; It has solutions to every single problem.