The famous old Börse, built in 1843, is an impressively colonnaded neoclassical structure. The porch is decorated with allegorical statues of the five continents. You can see the all-electronic trading floor on a free tour (in German and English). Make reservations by phone, online or at Frankfurt's tourist office at least a day ahead and bring ID.
In the square out front, a sculpture entitled Bulle und Bär depicts a showdown between a bull and a bear in which the former clearly has the upper hoof.