That's a tricky question! It sounds like you're asking about landmarks that are both natural and man-made. There's no single category that perfectly fits this description.

Here's why:

* Natural Landmarks: These are formed by natural processes like geological formations, mountains, rivers, etc. Examples include:

* Grand Canyon

* Niagara Falls

* Mount Everest

* Man-Made Landmarks: These are built by humans, like structures, monuments, etc. Examples include:

* Great Wall of China

* Eiffel Tower

* Statue of Liberty

However, there are some instances where human intervention has impacted natural landscapes, blurring the lines:

* Man-made features within natural landscapes: Think of dams creating artificial lakes, or canals carved through natural terrain. These are partly natural and partly man-made.

* Natural landscapes modified by humans: For example, many national parks have trails, roads, and visitor facilities that are man-made, but they still exist within a predominantly natural setting.

So, to answer your question, there is no definitive list of "natural man-made landmarks". Instead, you can think about landmarks that:

* Combine elements of both nature and human construction: For example, a bridge built across a spectacular natural canyon.

* Are a result of human interaction with nature: For example, a forest that has been managed for logging or a beach that has been artificially replenished.

It's important to consider the context and the relationship between human activity and the natural world when thinking about such landmarks.