And what signs would that be? The invented signs of modern prophecy preachers whose imagination gave us 666 on bar codes, thermonuclear weapons and Cobra helicopters in the book of Revelation?
The same pop prophecy preachers whose "sounds like" game deduces that "Rosh" is Russia, "Meshech" is the city of Moscow and "Tubal" is the city of Tobolsk?
The fact is that the signs Jesus spoke of were all signs that could be readily identified by "this generation", that is His contemporaries in the 1st century. He told His disciples "when you see Jerusalem surrounded by armies" they were to "flee to the mountains." This is precisely what the early Christians did in AD70 just before Rome sacked Jerusalem and destroyed the Temple.
And Jesus came back and we're all living in paradise.