Algol 60 was considered, by Tony Hoare, to be " a language so far ahead of its time that it was not only an improvement on its predecessors but also on nearly all its successors. "
Most languages designed since Algol have been fairly strongly based on its design, notably including:
Block structured statements
Variable scoping based on block structure
Structured control statements - If/then/else
Algol-like language that translates into Common Lisp