Actually de-dollarizing is probably the biggest threat to the US economy. Because the USA lives off the fact that quite a lot of dollars are hoarded worldwide as cash reserves. There are scenarios that see the USD below 10 Euro-Cents if the dollar fails to stay the default oil currency.
Must be the church St. Pancratius, built somewhere between 1100 and 1120.
The second-oldest building here is probably the remains of the castle of the poem “The castled crag of Drachenfels” by Lord Byron.