// works
Route::get('/', 'HomeController@showWelcome');

// 404
Route::get('/map', 'HomeController@showMap');

// 404
Route::get('/assets/{filename}', 'HomeController@getAsset');

Options +FollowSymLinks
RewriteEngine On

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^ index.php [L]

location / {
    try_files $uri $uri/ /index.php?$query_string;
}