On May 10th 1945, the 21st Army Group captured an important concentration of Heinkel long range bombers at Oslo Airport with special fuel tanks that allowed them to fly them 12.000km and cross the Atlantic. They were apparently about to attack the U.S. It would not have changed the issue of the war, but it could have affected the U.S. morale.
Also have you heard of the flying wing?
During Easter weekend of 1945, there was a sudden fire at Gothar Waggon Fabrik where the prototypes were being built. Not one relic, not even archives or a drawing survived and this secret weapon was never handed to the allies. Did it actually exist? Same thing for the T rocket.

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I have never heard of Heinkel long range bomber prototypes, but I don't know all LW prototypes and projects.

The only Heinkel "long range " bomber I know is the HE-177, but I don't think it had enough range to reach USA.

I know there were Messerschmitt Me 264 Amerika prototype, and also Junker 290 and 390 prototypes projects in the role of long range bombing, but never entered production, the most "advanced" project being the FW 300, a long range version of the Condor, but I dont know if a single prototype was ever built.

About the flying wing, I think you might be referring to the Go-229, IIRC a very few prototypes were built. It had a twin jet engine, but it was intended to be an interceptor, not a bomber.

I think (not sure) that USA captured many plans of this plane, and even one of the prototypes, so there is not particular mystery about this plane. It is now at the National Air and Space Museum (Smithsonian) but no longer on display.

Chocapic, you may have Historama n°242 from 1972. There is a nice article about these weapons in it called "les armes secretes d'Hitler". I think they are modified HE177, but the type is not mentionned. Maybe someone else will have more details on this secret aborted mission.
The flying wing I mention is not the Go but two other rare prototypes: the P60 and the HO18 Bomber (30 metres wide, 5.85 long , 1000km/h ) the HO18 was supposed to be able to carry a bomb load of 3500 kilo). If you are interested I can scan this article for you.

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www.luft46.com unleashed !

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Yes I know they were unleashed , but what about the captured Heinkels in Oslo? These were real (at least according to my sources)

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Ah, the Luft46 site! The Luftwaffe "wet dream" on the internet!

As to the rest:

There were only a handful of units that used the He 177, KG 1, KG 100 among them. One was stationed in Poland until it was disbanded in late 1944 due to the inability to operate the aircraft (no fuel). The other was in France and operated over the Western Mediterrainian and Bay of Biscay primarily in an antishipping role. To my knowledge no He 177's were stationed in Norway during the war. The primary anti-shipping aircraft there was the Ju 88 / 188.

Aside from that, a single He 177 took between 7 and 8 tons of as its normal load. It could carry about 4 tons of munitions maximum. Its normal range was about 2000 miles maximum with about a ton of bombs on board. So, to roughly double the range would require double the fuel, maybe a bit less. This means that it now has to tote about 14 to 16 tons of fuel to make the flight. Since this exceeds the load capacity of the bomber something would have to give. Remove the defense armament and crew, strip the armor off, etc. The bomb load would also have been miniscule.
Just from an engineering aspect this idea is obviously ridiculous. Practically, by mid 1944 the He 177 was virtually grounded simply through a lack of fuel. KG 1 was disbanded for this reason as mentioned.

The one Horten / Gotha design that flew was the Ho IX / Go 229 jet fighter that made a few test flights from Orainburg outside Berlin shortly before the war ended.

The Me 264 V1 America bomber was the sole flying prototype of this model. It was destroyed on the ground in mid 1944. The Ju 290 and 390 were, like the He 177 mostly grounded by mid 1944 through lack of fuel. The story that the Ju 390 flew to a point near the US coast in late 1944 is also a myth.

On the whole, this story seems very implausable.

I enjoyed the site though, quite relaxing, almost like reading a fiction book. I will try to find out more about the bombers in Norway, seems like it's just another legend then. TA, you seem to know a lot about these secret weapons . What happened to the V4 ? I have a picture of Bristish soldiers examining one near a railway.

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@ Skip : My mistake, I didn't knew these 2 prototypes and projects.