does any nice ancient place in Koln to see?

Answer 1

Sightseeing in Cologne
Over 2000 years ago the Romans settled what’s today Cologne and dubbed the city a Roman colony, "Colonia", in 50 ACE (the German name has stuck since then as Köln). Out of these times came a large number of artifacts which one can witness under the open sky or un- der the roof of the Römisch-Germanisches Museum (Roman-Germanic Museum). For those wishing to experience that history all the way up to the present, they should seek it out at the Kölnische Stadtmuseum (Cologne City Museum), Cologne’s old weapons depository.

Best "ancient" sites:

1. Cologne Cathedral.
The Dom is actually Germany’s largest cathedral. Its construction began in 1248, and was finished in 1880. The huge building covers a surface area of 8,000 sq. m., both towers stand 157 m tall. The Dom houses some unique treasures like the remains of the three Wisemen.

2. Old Town.
Everyone visiting Cologne ought to be part of a guided tour into the city's magic cathedral and through the Old Town with its beautiful squares, historical monuments and houses. Because there's no better and cheaper way to learn that much about the old roman town.

3. The Roman-Germanic Museum.
The museum belongs among the most loved in Germany because it houses artifacts from the Roman times, such as, the Dionysus mosaic, Poblicus’ tomb and worldwide the largest collection of Roman glass. One must unconditionally visit.

Taken from: http://www.nicecity.de/english/title_sights.htm

ALSO SEE official city page:
http://www.stadt-koeln.de/en/koelntourismus/index.html

Answer 2

The Koelner dom, Zoo, Central station (hauptbahnhof) and chrismiss markt in December.

Answer 3

The cathedral or "dom" is fantastic.