The Brits used a special weapon to 'reach out and touch' these hardened German targets. The Tall Boy was 21 feet long and weighed 12000+ pounds. It was designed to be dropped from about 40000 ft but the Lancasters could usually only make it up to around 20000 with this load. The fins were canted, the bomb spun up during descent, and it impacted at supersonic speeds. It typically buried itself 100 feet deep in soil and often penetrated reinforced concrete structures 15 to 20 feet thick (sub & E-boat pens at the coasts, V-1 factory roofs, etc). When it went off, it didn't so much make a big explosion above the ground, but it caused a 'seismic event' that would shake apart buildings, bridge supports, or pretty much anything else for several hundred yards around. Tall Boy was designed by Barnes Wallis (the same guy who designed the dam buster bombs) and built by Sheffield Steel in MONTHS during a war! (imagine trying to do that today). Tall Boy was superceded later in the war by the 20000 pound Grand Slam. There are websites somewhere (sorry for not having them ready to link here) with some pretty cool pictures.
If they had super-mega-penetrators like that 50 years ago, it kind of makes you wonder what they are dropping now over in the sand . . .