Subject of this diploma thesis are historical doors as an indivisible part of architecture. The main focus is on gradual discovering of their underrated artistic value and historical authenticity of these elements. The paper is divided into two parts, theoretical and practical part. The opening of the theoretical part introduces a debate on the ambivalent term ``door{\crqq} and its meaning in people{\crq}s life. I look closely at the terminology and particular basic structural types of historical door wings from the late medieval time to the end of the 19th century. All types are presented with several examples of extant doors in urban conservation area of the towns of České Budějovice and Třeboň between 1760-1900, using author drawing studies and photo documentation. In the practical part of the paper I deal with creative design of the parterre in the historical house no. 91 in the square of the town of Třeboň, which is directly linked to the prior theoretical findings. Drafts and an architectural study came out of the preliminary builder historical connections, elaborations and debates. At the same time I include an insight into parterre executions in the past years.