Here's an option using the rotating package; note that I have loaded the mwe just for demonstration

\documentclass{article}
\usepackage{rotating}
\usepackage{graphicx}
\usepackage{mwe}
\begin{document}
\begin{sidewaysfigure}
\centering
\includegraphics[width=\textheight,height=3cm]{example-image-a}
\caption{First caption}
\label{fig:first}
\includegraphics[width=\textheight,height=3cm]{example-image-b}
\caption{Second caption}
\label{fig:second}
\includegraphics[width=\textheight,height=3cm]{example-image-c}
\caption{Third caption}
\label{fig:third}
\end{sidewaysfigure}
\end{document}
If you'd prefer subfigures with (a), (b), (c), then you can use the subcaption package as follows (for example)

\documentclass{article}
\usepackage{rotating}
\usepackage{graphicx}
\usepackage{mwe}
\usepackage{subcaption}
\begin{document}
\begin{sidewaysfigure}
\centering
\begin{subfigure}{\textheight}
\includegraphics[width=\textheight,height=3cm]{example-image-a}
\caption{First caption}
\label{fig:first}
\end{subfigure}
\begin{subfigure}{\textheight}
\includegraphics[width=\textheight,height=3cm]{example-image-b}
\caption{Second caption}
\label{fig:second}
\end{subfigure}
\begin{subfigure}{\textheight}
\includegraphics[width=\textheight,height=3cm]{example-image-c}
\caption{Third caption}
\label{fig:third}
\end{subfigure}
\caption{Global caption}
\end{sidewaysfigure}
\end{document}
In both cases, you can apply some manual spacing if you wish using \vspace.