With an urban population around 700,000 and an area population of more than 2.3 million, Frankfurt am Main, more commonly known as Frankfurt, is the fifth-largest city in Germany. The largest financial center in continental Europe, Frankfurt is home to the European Central Bank as well as many of Germany’s largest commercial banks; its international airport and central train station are both very busy, making it a center of transportation as well. The area has artifacts from ancient Roman settlements; Frankfurt was an important city in the Holy Roman Empire and was hosting trade fairs as far back as the 12th century. The city today is an attractive blend of old and new, with landmarks like the Gothic Saint Bartholomew’s Cathedral, where emperors were crowned from the 16th to the 18th centuries; Saint Paul’s Church, a Protestant facility that was also the seat of the first democratically elected German Parliament; the Archeological Garden where fragments of ancient Roman settlements can be seen; and the charming Römerberg, a complex of nine former residences that form Frankfurt’s city hall. Also noteworthy is the Alte Oper or Old Opera, built in 1880 and refurbished 100 years later, and the iconic 15th-century Eschenheimer Tower, which originally served as a gate to the city.