ECCO contains many travel accounts, some illustrated, from the eighteeth century. The easiest way to find these is through a catalog search using the subject headings listed at right. It is also possible to search ECCO's interface and specify the types of images you are hoping to find.
Travel accounts were also frequently published in newspapers. British Periodicals Online and the Times Digital Archive will both allow you to search within British newspapers from the 17th to 20th centuries and limit to articles containing illustrations.