This site is online since 1999. I was quite lucky when I found screenshots of the old pages. Here’s a quick retrospect of v4.2

Topic: Professionalized site, fresh and modern design, improved business content
Technology: WordPress 5.2, customizr Theme, RSS
Date: 2019 v4.1

Topic: Professionalized site, added business content, moved to English
Technology: WordPress 3.4, iFeature Theme, RSS
Date: 2012 v4.0

Topic: Relaunch with WordPress
Technology: WordPress 3.0, PageLines Theme, RSS
Date: 2011 v3.0

Topic: Web 2.0 – here I am! Aggregation of many RSS feeds
Technology: HTML, CSS, JavaSript, PHP
Date: 2008-2009 v2.0

Topic: Online-‘blog’ during my USA internship
Technology: HTML, CSS, JavaSript, Perl
Date: 2001-2002 v1.5

Topic: Living in the U.S.A.
Technology: HTML only, CSS, JavaSript
Date: 2001 v1.4

Topic: Documentation of our trip through eastern U.S.A.
Technology: HTML only
Date: 2000 v1.3

Topic: My first stay in the U.S.A.
Technology: HTML only
Date: 1999