The architect Iktinos who designed the Parthenon did more than just that. On the Peloponnese peninsula, stands the by-him-designed temple of Apollo Epicurius, also called the temple of Bassae (Vasses). It is one of the best kept temples of its time and has some quite unique features. You can only walk around the temple but unfortunately not enter the central area. Inside used to be some nice friezes, which as so many ancient Greek art has been taken to London in the early 19th century.
For decades, this temple has been undergoing restoration works and in order to protect it from the elements it has been covered by a large tent, which prohibits a full-sized view. It looks like it will still be covered for quite a while. Many of the columns need to be entirely removed in order fix the fundaments of the temple.
The remote location of this temple still makes this World Heritage listed site also a great place to visit.